feat: propagate feature suppression in recompute

config/compatibility-matrix.json

@@ -2,9 +2,9 @@
   "schemaVersion": 1,
   "freecadBaseline": "freecad-1.1.1",
   "workbenches": {
-    "Part Design": { "status": "ui-prototype", "level": "read-only", "commands": ["create-body", "create-sketch", "pad", "pocket", "fillet", "chamfer", "linear-pattern", "polar-pattern"] },
-    "Part": { "status": "ui-prototype", "level": "read-only", "commands": ["primitive", "union", "cut", "intersection", "check-shape"] },
-    "Sketcher": { "status": "ui-prototype", "level": "read-only", "commands": ["new-sketch", "line", "arc", "circle", "rectangle", "constrain-horizontal", "constrain-vertical"] },
+    "Part Design": { "status": "facade-partial", "level": "experimental", "commands": ["create-body", "create-sketch", "pad", "pocket", "revolution", "fillet", "chamfer", "linear-pattern", "polar-pattern"] },
+    "Part": { "status": "facade-partial", "level": "experimental", "commands": ["primitive", "union", "cut", "intersection", "check-shape"] },
+    "Sketcher": { "status": "facade-model", "level": "experimental", "commands": ["new-sketch", "line", "arc", "circle", "rectangle", "constrain-horizontal", "constrain-vertical", "solve-sketch"] },
     "Draft": { "status": "ui-prototype", "level": "read-only", "commands": ["working-plane", "snap-settings", "draft-line", "draft-wire", "move", "rotate"] },
     "TechDraw": { "status": "ui-prototype", "level": "read-only", "commands": ["new-page", "view-part", "section-view", "dimension", "annotation"] },
     "Spreadsheet": { "status": "ui-prototype", "level": "read-only", "commands": ["new-sheet", "set-alias", "expression", "bind-property"] },
@@ -16,6 +16,12 @@
     "Surface": { "status": "ui-manifest", "level": "unsupported", "commands": ["bspline", "bezier", "fill-surface", "loft-surface", "trim-surface"] },
     "Inspection": { "status": "ui-manifest", "level": "unsupported", "commands": ["measure-distance", "measure-angle", "measure-area", "section", "check-dependencies"] }
   },
+  "facadeCapabilities": {
+    "geometry": { "level": "experimental", "provider": "BitBybit OCCT 1.1.1", "operations": ["box", "cylinder", "sphere", "cone", "placement", "union", "cut", "intersection", "part-primitive-recompute", "part-boolean-recompute", "shape-check", "pad", "pocket", "pocket-through-all", "revolution", "fillet", "chamfer", "feature-shape-cache", "face-edge-vertex-topology", "step-export", "stl-export"] },
+    "document": { "level": "experimental", "operations": ["typed-properties", "expressions", "units", "dependency-dag", "parallel-level-recompute", "sync-recompute", "async-generation-recompute", "undo-redo"] },
+    "sketcher": { "level": "experimental", "operations": ["point-line-circle-arc-model", "basic-constraints", "diameter-symmetric-tangent", "basic-solver", "persistence"] },
+    "fcstd": { "level": "read-only", "operations": ["zip-preflight", "document-xml-metadata", "proxy-report", "script-isolation"] }
+  },
   "rules": [
     "UI status does not imply geometry or file compatibility.",
     "Every implementation must update this matrix before claiming support.",

config/runtime-baseline.json

@@ -7,5 +7,5 @@
   "viewport": { "provider": "Three.js internal adapter", "package": "three", "version": "0.185.1", "baseline": "WebGL2", "status": "occt-mesh-integration" },
   "persistence": { "database": "@sqlite.org/sqlite-wasm 3.53.0-build1", "filesystem": "OPFS VFS with in-memory fallback", "writer": "single worker", "crossOriginIsolation": "required for OPFS worker", "status": "schema-v4-resource-autosave-properties-dependencies-sketch" },
   "targetBrowsers": "Capability matrix to be locked in P0-02",
-  "status": "expression-dag-and-subshape-signature-integration"
+  "status": "occt-feature-recompute-through-all-shape-cache-export-integration"
 }

docs/freecad-full-parity-plan.zh-CN.md

@@ -310,8 +310,40 @@
 
 TSN 已完成面级量化签名、唯一/重复候选判定和匹配 API，并挂接到 Bitbybit `MeshAsset`。签名刻意不使用 transient `faceIndex`；但是它还没有 OCCT 历史 `Generated/Modified/Deleted` 信息，也没有边/顶点和跨特征布尔历史映射。TSN-03、TSN-05、TSN-07、TSN-08 仍是完成 FreeCAD 稳定子形状命名的必要任务。
 
-Sketcher 已有 Facade 事务模型和基础求解器适配器：Sketch 几何/约束快照进入 `DocumentObjectSnapshot`，新增几何、约束和求解会更新 `ConstraintStatus`、历史、自动保存与 SQLite schema v4。该适配器的职责是验证数据模型和提供可替换协议；它不宣称已经等价于 FreeCAD `planegcs`。SK-03 的 planegcs WASM、SK-07 的完整约束分类、SK-09 的交互回放和 SK-10 的 B-spline 仍是兼容门禁。
+Sketcher 已有 Facade 事务模型和基础求解器适配器：Sketch 几何/约束快照进入 `DocumentObjectSnapshot`，新增几何、约束和求解会更新 `ConstraintStatus`、历史、自动保存与 SQLite schema v4；基础约束现覆盖 Diameter、Symmetric、Tangent。该适配器的职责是验证数据模型和提供可替换协议；它不宣称已经等价于 FreeCAD `planegcs`。SK-03 的 planegcs WASM、SK-07 的完整约束分类、SK-09 的交互回放和 SK-10 的 B-spline 仍是兼容门禁。
 
 Bitbybit 的 OCCT `filletEdges` 与 `chamferEdges` 已进入 Geometry Facade，支持全边或显式索引、参数验证、句柄版本和 Worker 隔离。由于 OCCT 瞬时边索引不是持久命名，当前接口仍不能作为 FreeCAD PartDesign 的长期选边引用；必须等 TSN 的边级 `TopoRef`、历史映射和参数化重算完成后，才能标记为 `compatible`。
 
 Geometry Facade 还接入了 Bitbybit IO 的 STEP 和 ASCII STL 导出，作为 FC-08/FC-09 的第一条交换格式垂直切片。导出数据仍只代表当前 Shape；对象树、Expression、Sketch 约束、TopoRef 和重算历史必须由 FCStd/.webcad 格式任务独立保存，不能因“能导出 STEP”而宣称参数化文件兼容。
+
+本轮又补齐了拓扑和恢复边界：面之外增加了由 BitBybit 网格端点派生的 edge/vertex 签名，并通过 `geometry.topology()` 返回面/边/点引用，签名使用量化坐标、长度/端点而不使用面索引；这仍不是 OCCT `Generated/Modified/Deleted` 历史。FCStd inspection 现在同时生成只读 `proxyDocument`，对象属性带有 `recognized/proxy/blocked` 状态；SQLite/OPFS Project API 增加 `recovery(documentId)`，报告完整性、schema、最后保存版本和降级警告。持久化写入现在在支持的浏览器使用 Web Locks 跨标签页互斥，并通过 BroadcastChannel 广播保存版本；无 Web Locks 环境明确报告 `local-queue`，不能解释为跨标签页安全。代理文档和恢复报告都不能被解释为 FCStd 参数化写回或崩溃恢复已经完成。
+
+## 17. 本轮后续实现记录与下一批任务
+
+本轮继续执行了重算、文件安全和命令能力三个关键边界。实现与验收必须按下面的定义理解，不能把“接口存在”解释成“FreeCAD 业务已完成”：
+
+| 任务 | 实施措施 | 验证结果 | 剩余边界 |
+|---|---|---|---|
+| P1-03 / DAG-06 重算执行器 | `RecomputeCoordinator` 为每次运行分配 generation；后发运行取消前发；节点完成后校验 AbortSignal、文档 ID/版本和当前 generation；结果状态为 `completed/failed/cancelled/stale`；按 DAG `levels` 使用 `Promise.all` 并行执行同层节点，并按稳定计划顺序合并结果和进度；可选的 `createFacadeGeometryRecomputeExecutor` 在 OCCT Worker ready 时执行真实 Pad/Pocket/Revolution/Fillet/Chamfer | 取消、过期版本、依赖失败传播、独立节点并行、闭合 Sketch 特征链、Revolution 角度/反向和 Facade 提交测试通过 | 默认数据模型仍不持久化 ShapeHandle；Up to face、拓扑历史映射、每节点独立 Worker 和完整 PartDesign 特征仍待实现；失败时缓存保留最近有效 Shape |
+| DAG-08 失败/抑制传播 | 上游 `error` 将下游置为 `upstream-failed`；Feature 的可持久化 `Suppressed` 属性将自身置为 `suppressed`、下游置为 `upstream-suppressed`，不误报重算失败；抑制时释放缓存 Shape，解除后只重算依赖闭包 | 上游失败、抑制跳过、Shape 释放、保存恢复和解除抑制最小闭包测试通过 | 多配置抑制、Body Tip 重定向、完整 FreeCAD 状态机和 Report 诊断树仍待实现 |
+| P4-06 任务提交与重算闭包 | Task 草稿在 Facade 事务内写入 Boolean Base/Tool 等链接；新对象和依赖闭包进入 `touched/dirty`，React OK 通过 `recomputeAsync()` 提交并反馈结果 | Boolean Task 链接/依赖测试、Task dirty 快照和完整验证通过 | Apply 预览仍未持久化临时 Shape；多选选择集、抑制对象和完整 FreeCAD Task 校验仍待实现 |
+| DAG-07 Body/Tip 与来源链接 | Part Design 特征提交时按来源类型绑定 Profile/Base，更新只读 Body.Tip，并将 Body 与新特征一并纳入 dirty/recompute 闭包；Undo/Redo 恢复 Tip | Pad Task、Body.Tip、Undo/Redo 回归测试通过 | 单实体规则、Tip 抑制/重定向、复杂容器和跨 Body 支持仍待实现 |
+| SK-04 求解器边界 | Sketch 节点通过可替换 executor 求解；冲突/无效约束阻止下游，求解结果作为对象更新返回 | 基础 Sketch solve 与异步对象更新测试通过 | 当前是基础 TypeScript solver，不是 `planegcs` WASM；高级约束、拖拽、外部几何和 B-spline 未完成 |
+| FC-03 ZIP 安全读取 | 先读中央目录再解压；限制 archive/entry/total 字节、压缩比、条目数；拒绝路径穿越、重复路径、加密项、ZIP64 和 XML entity | 缺 Document.xml、路径穿越、压缩炸弹测试通过 | 尚未恢复 BRep/Shape、视图、表达式和参数化对象 |
+| FC-04/FC-07 只读报告 | `project.fcstd.inspect()` 解析 Document.xml 对象声明、Label、属性数量和类型；未知类型为 proxy，Python 类型为 blocked；脚本资源只告警且不执行 | recognized/proxy/blocked 分类和 Facade-only 测试通过 | `metadata-compatible` 仅表示 XML 元数据可读，不表示 FCStd 可编辑或 round-trip |
+| P2-04 Project list/load | `project.list()` 暴露 SQLite/内存快照摘要，`app.document.load()` 将选定快照作为活动 Document 事务恢复，清理旧重算/Shape/Task 状态、保留 Undo 边界并按完整对象图异步重算；Projects 页面按 documentId 调用 Facade API | 列表摘要、保存→修改→加载后属性恢复、选择清空、任务清空和加载重算调用通过测试 | FCStd 导入仍是只读 metadata/proxy；跨文档 ShapeHandle 和 Shape 持久化仍待完成 |
+| P2-03 Resource/recovery fallback | SQLite Worker 在无 OPFS 的浏览器中使用内存资源表，保留 SHA-256 身份和引用计数；恢复报告区分数据库完整但目标文档缺失的 `unavailable`；销毁 Worker 时清空临时资源 | Worker 类型检查、生产构建通过 | 内存资源会随刷新丢失；配额回收、持久资源校验和大文件压力仍待实现 |
+| PART-07 Shape check | `check-shape` 使用 Facade `geometry.topology()` 生成面/边/顶点数量和 `SHAPE_CHECK_PASSED` 信息诊断；空缓存、空拓扑和 Worker 错误分别返回结构化失败诊断 | 无 Shape、错误选择前置和拓扑调用边界通过测试/构建 | 当前是网格派生拓扑检查，不等价于 OCCT `BRepCheck_Analyzer`，完整修复建议和自交诊断仍待实现 |
+| P1-02 命令准确性 | manifest 仍可完整展示；Part `primitive/union/cut/intersection` 与 Part Design 核心命令已有 Facade executor；命令状态同时检查工作台和对象类型选择谓词；其余未接入 executor 的命令返回 disabled 与 `COMMAND_UNIMPLEMENTED`，不再静默完成 | Part 基本体/布尔 Shape 缓存、选择不兼容时的禁用原因、`linear-pattern` 状态与诊断测试通过 | 其余工作台要逐项增加真实 executor、Task 参数和黄金回放后才能启用 |
+
+后续按以下顺序连续开发：
+
+1. `P4-06/DAG-08`：同步/异步重算已共享抑制传播语义，并支持解除抑制后的最小闭包重算；继续补齐多配置抑制、Body Tip 重定向和诊断树。最近有效 Shape 缓存已进入 Facade，但尚未持久化。
+2. `P3-04/P3-05`：Pad/Pocket/Revolution/Fillet/Chamfer 已有 OCCT Worker 输入适配和 Shape 缓存回写，Pocket Through all 已接入；继续补齐 Up to face、拓扑历史和 Pattern/Hole，未完成前保持 disabled。
+3. `TSN-03/05/07/08`：补齐 edge/vertex 签名、OCCT Generated/Modified/Deleted 历史、跨特征迁移和歧义处理；任何 transient index 不得写入持久引用。
+4. `SK-03/SK-06/SK-07`：编译和验证 planegcs WASM，按基础/高级约束建立 FreeCAD 黄金回放；基础 solver 维持 experimental。
+5. `P2-04/P2-05/P2-06`：完成保存点恢复报告、迁移回滚、配额回收和 BroadcastChannel 单写者冲突。
+6. `FC-04/05/06/10`：增加 XML/Shape/Expression/Link 映射，未知字段原样保留，完成 WebCAD↔FCStd↔FreeCAD 差异报告。
+7. `P6-03/P8-02`：把 disabled 原因、重算进度/取消、FCStd 报告和能力矩阵接入 React，并通过目标浏览器回放和视觉基线。
+
+启用规则：`RecomputeExecutionResult.status=completed` 只表示已注册节点成功；FCStd `metadata-compatible` 只表示安全元数据可读；只有 FreeCAD 对照黄金测试、取消/失败/只读、保存/加载和跨浏览器门禁都通过，才能把对象或命令从 `experimental` 提升到 `compatible`，`exact` 还要求锁定版本后的逐项差异为零。

docs/web-cad-implementation-plan.zh-CN.md

@@ -1403,13 +1403,13 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 | 全量静态页面和 CAD Workspace | `DONE` | `src/App.tsx`、`src/styles.css`；桌面/移动截图验收通过 |
 | 工作台/菜单/命令机器可读 manifest | `DONE` | `src/freecadManifest.ts`，13 个工作台和命令分组 |
 | BitBybit Web CAD Facade 最小合同 | `DONE` | `src/facade/types.ts`、`src/facade/mockFacade.ts`；真实内核适配仍待 P3/P4 |
-| FreeCAD/OCCT 几何 WASM | `PLANNED` | 由 P3 工作包实施；当前只有确定性 Mock 几何结果 |
+| FreeCAD/OCCT 几何 WASM | `IN PROGRESS` | `src/facade/geometryRuntime.ts` 已通过 BitBybit OCCT 1.1.1 Worker 接入基本体、布尔、Pad/Pocket/Revolution、Fillet/Chamfer 和 STEP/ASCII STL 导出；FreeCAD 自构建内核和完整特征历史仍未完成 |
 | Three.js 真实视口适配器 | `IN PROGRESS` | `src/facade/threeViewport.ts`，锁定当前最新 `three@0.185.1`，WebGL2 适配器已挂入 Facade |
 | React Facade 投影和静态替身 | `DONE` | 工作台、选择、文档树、通知已由 Facade 事件驱动 |
-| SQLite WASM + OPFS 持久化 | `IN PROGRESS` | `projectSchema.ts`、`persistenceWorker.ts` 和 `projectStore.ts` 已落地；Worker 具备 OPFS VFS/内存降级和 Document/Object 保存恢复，自动保存、迁移回滚、配额与跨标签写者仍待 P2-02/P2-06 |
-| 标准格式与 FCStd 兼容 | `PLANNED` | 由 P7 工作包实施 |
+| SQLite WASM + OPFS 持久化 | `IN PROGRESS` | schema v4、OPFS/内存降级、单写者队列、内容寻址资源、自动保存已落地；迁移回滚、配额回收、跨标签写者和崩溃恢复仍待 P2 |
+| 标准格式与 FCStd 兼容 | `IN PROGRESS` | BitBybit STEP/ASCII STL 导出已接入；`src/facade/fcstd.ts` 已完成安全 ZIP 预检和 Document.xml 元数据/代理报告，FCStd 对象映射、BRep 读写和 round-trip 仍待 P7 |
 | Facade 单元测试和入口依赖守卫 | `DONE` | `tests/facade.test.ts`、`scripts/check-facade-boundary.mjs` |
-| 自动化测试、性能门禁和发布流水线 | `IN PROGRESS` | P8-01 第一批 Facade 测试已通过；跨浏览器和黄金几何仍待后续 |
+| 自动化测试、性能门禁和发布流水线 | `IN PROGRESS` | `./npmw run verify` 已通过 46 个 Facade 测试、入口守卫和构建；跨浏览器、黄金几何、压力、fuzz 和发布流水线仍待 P8 |
 
 ### 16.3 阶段门和交付节奏
 
@@ -1456,7 +1456,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 | P2-02 | 建立 Persistence Worker 和单写者队列 | Worker、请求/响应协议 | P1-03 | 1000 次事务无丢失且不阻塞 UI |
 | P2-03 | 实现 OPFS 数据库/资源管理 | 哈希、引用计数、配额处理 | P2-01 | 资源可写入、校验和清理 |
 | P2-04 | 实现自动保存、恢复和备份 | Project API、恢复报告 | P2-02/P2-03 | 强刷后恢复最后有效保存点 |
-| P2-05 | 实现多标签页通知和锁冲突 | BroadcastChannel、单写者提示 | P2-02 | 第二标签页不能静默覆盖 |
+| P2-05 | 实现多标签页通知和锁冲突 | BroadcastChannel、Web Locks 互斥、`subscribeExternalChanges`、单写者提示 | P2-02 | 支持 Web Locks 时第二标签页不能静默覆盖；不支持时能力矩阵明确标记 `local-queue` 降级 |
 | P2-06 | 实现能力检测和降级 | capability matrix、备份入口 | P2-03 | 不支持 OPFS 时可显式导出恢复 |
 
 #### P3：FreeCAD/OCCT 几何运行时
@@ -1466,7 +1466,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 | P3-01 | 复现 FreeCAD/OCCT/BitBybit 构建 | WASM 构建脚本、资源清单 | G0/G1 | 干净环境生成同一 hash |
 | P3-02 | 定义 ShapeHandle、SubshapeRef、MeshAsset | 句柄/拓扑/三角化类型 | P1-04 | 不暴露底层指针或临时索引 |
 | P3-03 | 实现基本体和变换 | Box、Cylinder、Sphere、Cone、Placement | P3-01 | 尺寸和包围盒误差在预算内 |
-| P3-04 | 实现 Boolean、Pad/Pocket、Revolution | Kernel Adapter、诊断 | P3-03 | 可取消，失败保留有效结果 |
+| P3-04 | 实现 Boolean、Pad/Pocket、Revolution | Kernel Adapter、诊断；Pocket `throughAll` 基体范围计算 | P3-03 | 可取消，失败保留有效结果；`Up to face` 未实现时必须返回明确诊断 |
 | P3-05 | 实现 Fillet、Chamfer、Pattern、Hole | 特征执行器 | P3-04 | 错误包含输入和子形状上下文 |
 | P3-06 | 建立性能、内存和资源回收基准 | benchmark 报告 | P3-03 | 达到预算或形成降级决策 |
 
@@ -1476,7 +1476,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 |---|---|---|---|---|
 | P4-01 | 实现 Document/Object/Container/Feature/Shape | 领域包和序列化投影 | G1 | UUID、类型、标签和生命周期稳定 |
 | P4-02 | 实现 Property/Link/Expression/Unit | 元数据、校验和单位换算 | P4-01 | Data/View 编辑器由 metadata 驱动 |
-| P4-03 | 实现依赖 DAG、脏标记和拓扑调度 | recompute scheduler | P4-01 | 只重算受影响闭包 |
+| P4-03 | 实现依赖 DAG、脏标记和拓扑调度 | recompute scheduler、稳定 `levels`、同层并发执行 | P4-01 | 只重算受影响闭包；同层对象无依赖；调度器以 `Promise.all` 并发执行并按计划顺序提交结果，未来再下沉到并行 Worker |
 | P4-04 | 实现事务、撤销/重做和保存点 | Command Bus、undo journal | P4-03 | 100 次撤销/重做可回到原 hash |
 | P4-05 | 实现 Body/Tip/特征顺序/可见性 | PartDesign 领域规则 | P4-01/P3-04 | 非法多实体和 Tip 操作被拒绝 |
 | P4-06 | 实现诊断树和失败恢复 | Diagnostic model、repair actions | P4-03 | 失败节点可定位、回退或修复 |
@@ -1486,7 +1486,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 | ID | 任务 | 输出 | 前置 | 退出条件 |
 |---|---|---|---|---|
 | P5-01 | 实现 WebGL2 renderer、相机和场景生命周期 | Viewport Adapter | P1-04 | 创建/销毁视口无 GPU 泄漏 |
-| P5-02 | 实现 Shape/mesh 增量更新和缓存 | BufferGeometry、材质缓存 | P3-02 | 单特征更新不重建整个场景 |
+| P5-02 | 实现 Shape/mesh 增量更新和缓存 | BufferGeometry、材质缓存；Pad/Pocket OCCT 预览链 | P3-02 | 单特征更新不重建整个场景；预览链在卸载时释放全部 Shape 句柄 |
 | P5-03 | 实现对象/面/边/点拾取和预选 | Selection mapping | P3-02/P4-01 | 拾取返回稳定 SubshapeRef |
 | P5-04 | 实现导航、标准视图、剖切、网格和测量 | Gui/Viewport commands | P5-01 | 视口和文档状态可区分 |
 | P5-05 | 建立百万三角形和大装配基准 | 性能/内存报告 | P5-02 | 达到预算或触发 LOD 后备 |
@@ -1498,7 +1498,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 |---|---|---|---|---|
 | P6-01 | 将静态页面接入 Facade Provider | projection adapter | P1-05/P4-01 | React 不维护第二套文档真值 |
 | P6-02 | 接入 Model/Tasks/Property/Selection 投影 | Combo View、Task Dock | P4-02/P4-05 | 选择、属性、任务单向同步 |
-| P6-03 | 接入命令/工作台状态 | manifest runtime adapter | P1-02/P4-03 | disabled 原因可展示且不会执行 |
+| P6-03 | 接入命令/工作台状态 | manifest runtime adapter | P1-02/P4-03 | disabled 原因可展示且不会执行；Diagnostics 页面实时展示 Facade/OCCT/SQLite/OPFS 能力 |
 | P6-04 | 接入真实 Viewport 和报告视图 | Three.js adapter、diagnostics | P5-03/P4-06 | 可见预览、提交和错误结果 |
 | P6-05 | 完成 Part/Part Design/Sketcher 垂直 UI | Core 1 页面 | P3-04/P4-05/P5-04 | G5 流程通过 |
 | P6-06 | 完成键盘、窄屏、只读和恢复状态 | a11y/UX regression | P6-02 | 核心流程可键盘完成 |
@@ -1509,7 +1509,7 @@ SQLite 是运行时的主存储，不要求项目包直接暴露数据库内部
 |---|---|---|---|---|
 | P7-01 | STEP/IGES/网格导入 | importer、进度、取消 | P3-03/P4-01 | 样例树、单位和形状可检查 |
 | P7-02 | STEP/IGES/网格/GLB 导出 | exporter、单位/材质策略 | P3-02/P5-02 | 目标工具可重新打开 |
-| P7-03 | Web CAD 项目包导入导出 | manifest、hash、schema version | P2-04 | 干净浏览器可恢复 |
+| P7-03 | Web CAD 项目包导入导出 | manifest、hash、schema version；Facade Shape 的 STEP/STL 下载 | P2-04 | 干净浏览器可恢复；没有有效 Shape 时导出按钮必须给出重计算诊断 |
 | P7-04 | FCStd A 档对象映射 | compatibility importer | P4-01/P4-02 | 支持对象有等级，其余有 proxy 报告 |
 | P7-05 | FCStd B/C 档差异评估 | golden samples、差异报告 | P7-04 | 无静默丢失 |
 
@@ -1585,22 +1585,25 @@ P0 基线/治理
 | P0-02 运行时版本基线 | `IN PROGRESS` | `config/runtime-baseline.json` 已建立；Three.js 锁定 `0.185.1`，Bitbybit OCCT Worker/OCCT/Base 锁定 `1.1.1` 并记录 WASM SHA-256；FreeCAD 自构建内核仍待锁定 |
 | P0-03 兼容矩阵 | `DONE` | `config/compatibility-matrix.json` 覆盖 13 个工作台和命令状态 |
 | P1-01 Facade 最小合同 | `DONE` | `src/facade/types.ts` 定义 App/Gui/Command/Selection/Task/Viewport 合同 |
-| P1-02 命令状态和选择前置 | `DONE` | MockFacade 根据工作台、选择对象和命令清单返回 enabled/disabled 原因 |
+| P1-02 命令状态和选择前置 | `DONE` | MockFacade 根据工作台、选择对象类型和命令清单返回 enabled/disabled 原因；Part 布尔/检查仅接受 Shape-producing 对象，Sketcher 求解仅接受 Sketch，Part Design 特征拒绝文件夹和无几何对象 |
 | P1-03 请求上下文、事件和诊断 | `DONE` | 命令事件携带 API 版本、请求 ID、文档 ID/版本和工作台；禁用命令生成结构化诊断 |
 | P1-05 MockFacadeAdapter | `DONE` | `src/facade/mockFacade.ts`，React 工作区已通过事件投影工作台、选择、文档树和通知 |
 | P1-06 Facade-only 依赖守卫 | `DONE` | `scripts/check-facade-boundary.mjs`，禁止 UI 绕过入口导入 Three.js/SQLite/OPFS/Worker |
-| P4-01/P4-04 Document/Object 与事务最小切片 | `IN PROGRESS` | Pad/Pocket/Fillet/Chamfer 等已通过 Task 确认追加到 Body；文档版本、dirty 标志和 Undo/Redo 已接通，完整属性、依赖 DAG 和重计算仍待实现 |
-| P4-02 Property/Link/Unit | `IN PROGRESS` | DocumentObject 已携带 Data/View 类型化属性元数据；编辑经过 Facade 校验、版本、dirty、Undo/Redo、autosave 和 SQLite `object_properties`；Expression 求值、单位换算、多选 mixed 与链接循环仍待实现 |
-| P2-01/P2-02 SQLite schema 与 Persistence Worker | `IN PROGRESS` | `src/facade/projectSchema.ts` 固定 schema v1；`src/facade/persistenceWorker.ts` 独占 SQLite 连接并提供 OPFS/内存模式；`PersistenceWriteQueue` 已保证单写者顺序和失败后续写，1000 次压力、迁移回滚、恢复演练和跨标签写者仍待补齐 |
+| P4-01/P4-04 Document/Object 与事务最小切片 | `IN PROGRESS` | Pad/Pocket/Fillet/Chamfer 等已通过 Task 确认追加到 Body；新增 Part Design 特征会原子更新 Body.Tip，并按 Sketch/实体来源写入 Profile/Base；Feature 支持可持久化抑制、下游跳过、Shape 释放和解除后的最小闭包重算；文档版本、dirty、Undo/Redo、异步重算 generation 和过期结果拒绝已接通；真实 Shape 事务、完整容器/Tip 重定向规则和原子崩溃恢复仍待实现 |
+| P4-02 Property/Link/Unit | `IN PROGRESS` | DocumentObject 已携带 Data/View 类型化属性元数据；编辑经过 Facade 校验、版本、dirty、Undo/Redo、autosave 和 SQLite `object_properties`；基础表达式/单位/Link DAG 和常用数学函数已落地，locale、多选 mixed 和持久引用迁移仍待实现 |
+| P2-01/P2-02 SQLite schema 与 Persistence Worker | `IN PROGRESS` | `src/facade/projectSchema.ts` 固定 schema v4；`src/facade/persistenceWorker.ts` 独占 SQLite 连接并提供 OPFS/内存模式；`PersistenceWriteQueue` 已保证单写者顺序和失败后续写，1000 次压力、迁移回滚和恢复演练仍待补齐；跨标签写入已由 P2-05 通过 Web Locks/降级能力标记覆盖 |
 | P2-03 OPFS 资源管理 | `IN PROGRESS` | Worker 已提供 SHA-256 内容寻址、`bitbybit-assets` 目录、引用计数、读取和释放；浏览器验证通过，配额治理、垃圾回收扫描和大资源压力仍待补齐 |
-| P2-04 自动保存调度 | `IN PROGRESS` | `ProjectAutosaveScheduler` 在 Facade 文档事务后按空闲窗口合并最新版本，显式 Save 仍立即写入；恢复报告、崩溃点检测和用户可配置策略仍待补齐 |
-| P5-01 Three.js 视口适配器 | `IN PROGRESS` | `src/facade/threeViewport.ts` 使用 `three@0.185.1`，已挂载 WebGL2 场景和资源释放 |
+| Worker memory resource fallback | `PASS` | Worker 在 SQLite WASM 无 OPFS 时使用 transient content-addressed resource map，保持 `put/get/release` 引用计数语义；不再把资源 API 错误地绑定到 OPFS |
+| P2-04 自动保存调度 | `IN PROGRESS` | `ProjectAutosaveScheduler` 在 Facade 文档事务后按空闲窗口合并最新版本，显式 Save 仍立即写入；`project.recovery(documentId)` 已提供 SQLite/内存完整性、最后保存版本和警告报告，崩溃点检测和用户可配置策略仍待补齐 |
+| Document list/load/recovery transaction | `PASS` | `project.list()` 从 SQLite/内存快照返回 documentId、版本、对象数、dirty/readOnly 和更新时间；`app.document.load(documentId)` 通过 Project Facade 恢复快照，取消旧重算、释放缓存 Shape、清空选择/任务、提交可撤销的活动文档并按完整对象图异步重算；Recovery 对“数据库完整但目标快照不存在”返回 `unavailable`，工程管理页按真实 ID 打开 |
+| P2-05 多标签页写入协调 | `DONE (降级可观测)` | `SqliteProjectPersistence` 在保存和资源写入外包 `navigator.locks` 独占锁，成功保存通过 `BroadcastChannel` 广播文档版本，Facade 暴露 `project.subscribeExternalChanges()`；无 Web Locks 的运行时能力标记为 `local-queue`，不宣称跨标签页互斥 |
+| P5-01 Three.js 视口适配器 | `IN PROGRESS` | `src/facade/threeViewport.ts` 使用 `three@0.185.1`，已挂载 WebGL2 场景和资源释放；React 视口通过 Facade OCCT 预览链生成 Pad/Pocket Mesh |
 | P3-01 Bitbybit OCCT WASM 运行时 | `IN PROGRESS` | 精确锁定 `@bitbybit-dev/occt-worker@1.1.1`，专用 Worker 可加载 34,524,750 字节 OCCT WASM；尚未建立 FreeCAD/OCCT 自构建脚本，不能标记完成 |
-| P3-02 几何句柄与网格协议 | `IN PROGRESS` | Facade 已定义并实现受控 `ShapeHandle`、`MeshAsset`、`SubshapeRef` 类型；句柄携带 documentId/version，底层 OCCT hash 不出运行时，跨文档、字段篡改和释放后访问被拒绝；稳定子形状命名尚未实现 |
+| P3-02 几何句柄与网格协议 | `IN PROGRESS` | Facade 已定义并实现受控 `ShapeHandle`、`MeshAsset`、`SubshapeRef` 类型；句柄携带 documentId/version，底层 OCCT hash 不出运行时，跨文档、字段篡改和释放后访问被拒绝；`geometry.topology()` 已从 BitBybit 网格生成面/边/点基础签名，OCCT 历史命名仍未实现 |
 | P3-03 基本体和变换 | `IN PROGRESS` | 真实 OCCT Box/Cylinder/Sphere/Cone 和 FreeCAD 风格 Placement 已通过浏览器矩阵；0.05 mm 网格精度下曲面包围盒最大离散误差约 0.023 mm；自动化浏览器黄金测试尚未进入 CI |
-| P3-04 Boolean/Pad/Pocket/Revolution | `IN PROGRESS` | 文档作用域 Union/Cut/Intersection 与 PlanarProfile 驱动的 Pad/Pocket/Revolution 已通过真实 OCCT 浏览器矩阵；取消、进度、Through all/Up to face 和文档重计算接线尚未完成 |
-| P5-02 网格增量接入 | `IN PROGRESS` | Three Adapter 可用 `BufferGeometry` 接收 Facade `MeshAsset`，替换时释放旧 GPU geometry；对象缓存与文档增量同步尚未实现 |
-| P8-01 第一批自动化场景 | `IN PROGRESS` | `tests/facade.test.ts` 已覆盖初始化、schema、串行持久化队列、自动保存合并、资源引用、事件、任务生命周期、禁用命令、请求上下文、特征提交和历史；E2E/黄金几何待补齐 |
+| P3-04 Boolean/Pad/Pocket/Revolution | `IN PROGRESS` | 文档作用域 Union/Cut/Intersection 与 PlanarProfile 驱动的 Pad/Pocket/Revolution 已通过真实 OCCT 浏览器矩阵；重算 executor 已在 Worker ready 时执行 Pad/Pocket/Revolution，Revolution Angle/Reversed 已接入，Fillet/Chamfer 也有 Shape 缓存回写；Up to face、FCStd Shape 持久化仍待完成 |
+| P5-02 网格增量接入 | `IN PROGRESS` | Three Adapter 可用 `BufferGeometry` 接收 Facade `MeshAsset`，替换时释放旧 GPU geometry；视口优先使用重计算缓存的对象 Shape，失败时保留最近有效结果，无缓存时才创建并释放 Pad/Pocket 临时预览链；对象级增量缓存与选择映射尚未实现 |
+| P8-01 第一批自动化场景 | `IN PROGRESS` | `tests/facade.test.ts` 已覆盖 46 个场景，包括 Part 命令、基本体/布尔重算、async generation 重算、DAG 分层并行、抑制传播/恢复、OCCT 特征执行器、FCStd 安全检查、schema、串行/跨标签持久化、资源引用、事件、任务、禁用/未实现命令、历史和表达式；E2E/黄金几何待补齐 |
 
 本迭代验证命令：`npm run check:facade-boundary`、`npm run test:facade`、`npm run build`。构建产物将 Three.js 拆为独立 chunk，避免把全部渲染库重复打入应用主 chunk。当前 npm registry 的 `three` 最新版本为 `0.185.1`，已在 `package.json` 和运行时基线中锁定。下一迭代继续完成 P0-01/P0-02 的精确锁定、P2-01/P2-02 的 SQLite/OPFS schema 与 Worker 单写者实验，以及 P3-01 的 FreeCAD/OCCT WASM 构建验证。
 
@@ -1618,7 +1621,7 @@ P0 基线/治理
 | Three.js WebGL2 | `PASS` | Chrome SwiftShader 工作区检测到 1 个 canvas 且 `getContext('webgl2')` 成功 |
 | 降级路径 | `PASS` | Node Facade 测试使用显式内存 Project adapter；不会假称 OPFS 已可用 |
 
-仍未通过 G4/G5：自动保存恢复报告、1000 次压力报告、崩溃恢复、迁移回滚、跨标签写者、几何 Shape 资源和完整 FreeCAD/OCCT 计算尚未接入；这些继续由 P2-02 至 P4-06 负责。
+仍未通过 G4/G5：自动保存恢复报告、1000 次压力报告、崩溃恢复、迁移回滚、完整 FCStd Shape 资源持久化和完整 FreeCAD/OCCT 计算尚未完成；当前 Facade 已有内存 Shape 缓存和 Pad/Pocket/Fillet/Chamfer executor，但这些仍由 P2-02 至 P4-06 的剩余任务负责。
 
 ### 16.11 P3 Bitbybit OCCT 几何运行时验证记录
 
@@ -1680,17 +1683,21 @@ OCCT Boolean 结果可能与源形状共享底层拓扑。1.1.1 的 `deleteShape
 | X `[1,2]`、Y `[-1,1]` 面绕 Y 轴 360° Revolution | 212 顶点、208 三角形 | X `[-2,2]`、Y `[-1,1]`、Z 约 `[-1.9854,1.9854]` |
 | 释放全部特征结果后访问 Pocket 基体 | `PASS` | 基体仍为 24 顶点、12 三角形，包围盒不变 |
 
-Pad/Pocket 的方向向量在 Facade 内归一化，`length` 单独控制尺寸；`reversed` 改变方向，`symmetricToPlane` 将起始面移动到长度中点。Revolution Worker 插件支持任意轴原点和方向，弥补 Bitbybit 1.1.1 高层 `revolve` 固定绕原点轴的限制。当前 Pocket 是长度模式；`Through all`、`Up to face`、双向长度和轮廓支持面映射继续由 P4-02/P4-05 与 P3-04 后续任务实现。
+Pad/Pocket 的方向向量在 Facade 内归一化，`length` 单独控制尺寸；`reversed` 改变方向，`symmetricToPlane` 将起始面移动到长度中点。Revolution Worker 插件支持任意轴原点和方向，弥补 Bitbybit 1.1.1 高层 `revolve` 固定绕原点轴的限制。Pocket 的 `Through all` 现在读取基体网格投影范围，按范围加余量生成对称切削工具；`Up to face`、双向长度和轮廓支持面映射继续由 P4-02/P4-05 与 P3-04 后续任务实现，未支持时返回 `UP_TO_FACE_UNSUPPORTED`，不会退化为固定长度。
 
 ### 16.15 P4-02 Property 元数据与编辑器验证记录
 
-DocumentSnapshot 现在区分模型树投影与 `DocumentObjectSnapshot` 真值。每个对象包含 FreeCAD 风格的 `typeId` 和类型化 Property：String、Length、Bool、Enumeration、Link、Color、Percent、Float；metadata 同时声明 Data/View scope、group、unit、readOnly、hidden、recompute、options 和 expression。React 不再按 Pad/Pocket 名称硬编码属性行。
+DocumentSnapshot 现在区分模型树投影与 `DocumentObjectSnapshot` 真值。每个对象包含 FreeCAD 风格的 `typeId` 和类型化 Property：String、Length、Angle、Bool、Enumeration、Link、Color、Percent、Float；metadata 同时声明 Data/View scope、group、unit、readOnly、hidden、recompute、options 和 expression。React 不再按 Pad/Pocket 名称硬编码属性行；Angle 属性使用 deg 单位和 0–360°输入约束。
 
 | 检查 | 结果 | 证据 |
 |---|---|---|
 | Data 编辑 | `PASS` | 浏览器将 Pad Length 从 42 改为 50，树版本 v18→v19、对象 Status→Touched、tree state→dirty |
 | View/Data 分离 | `PASS` | Visibility 等 View 属性提交文档事务但不把几何对象标记 Touched |
 | 类型控件 | `PASS` | View 标签由 metadata 生成 1 个 checkbox、2 个 enumeration、2 个 numeric、2 个 color 控件 |
+| Part primitive Task | `PASS` | Part 工作台任务可选择 Box/Cylinder/Sphere/Cone，尺寸和角度草稿写入 `Part::*` 对象属性并进入 OCCT 重算 |
+| Part Boolean Task | `PASS` | Union/Cut/Intersection 任务提供 Base/Tool 对象选择槽，链接写入对象依赖图；确认后将新对象及其依赖闭包标记 dirty 并触发异步重算 |
+| Part Design Task | `PASS` | Pad/Pocket/Revolution/Fillet/Chamfer 任务草稿写入 Length/Type/Angle/Reversed/Midplane/Radius/Distance 属性，确认后仍通过 Facade 历史边界提交 |
+| 选择谓词 | `PASS` | 选择 Origin/文件夹后 Part Union/Check geometry 被禁用；选择非 Sketch 对象后 Sketcher Solve 被禁用，并返回可解释原因 |
 | 校验 | `PASS` | 负 Length、越界 Percent、未知 Enumeration、无效颜色、缺失 Link、只读 Property 在 Facade 拒绝 |
 | Undo/Redo | `PASS` | Length 42→50 可撤销回 42、重做至 50，Property 和树投影同步 |
 | SQLite/OPFS | `PASS` | Chrome `sqlite-opfs` 保存 v19 后重新加载 Length=61、Status=Touched、tree state=dirty |
@@ -1698,7 +1705,7 @@ DocumentSnapshot 现在区分模型树投影与 `DocumentObjectSnapshot` 真值
 
 持久化复用 schema v1 已有 `object_properties` 表：`value_json` 保存完整 Property snapshot，`property_type` 保留可查询类型；删除/重写对象时依赖外键级联清理旧属性。内存降级、autosave、Undo/Redo 和 Facade state 均使用深拷贝，避免 options/property 数组共享引用。
 
-当前限制：Expression/Quantity 已完成基础词法、四则运算、长度/角度/百分比换算、对象属性引用和维度校验；函数库、locale 规则、Spreadsheet alias 和完整 FreeCAD 表达式兼容仍待 EXU。PropertyLink、Expression 和下游对象现在进入统一依赖 DAG，支持 SCC 循环诊断、拓扑重算计划和 schema v3 持久化；当前重算执行器仍是 Facade 领域切片，尚未把每个节点调度到 OCCT/Sketcher Worker。多选 mixed、批量编辑、重置默认值和属性搜索仍由 P4-02/P6-02 后续任务完成。
+当前限制：Expression/Quantity 已完成基础词法、四则运算、`^` 幂运算、长度/面积/体积/角度/百分比换算、对象属性引用、维度校验，以及 `abs/sin/cos/tan/atan2/min/max/clamp/round/pow` 函数的基础维度规则；locale 规则、Spreadsheet alias 和完整 FreeCAD 表达式兼容仍待 EXU。PropertyLink、Expression 和下游对象现在进入统一依赖 DAG，支持 SCC 循环诊断、拓扑重算计划和 schema v3 持久化；当前重算执行器仍是 Facade 领域切片，尚未把每个节点调度到 OCCT/Sketcher Worker。多选 mixed、批量编辑、重置默认值和属性搜索仍由 P4-02/P6-02 后续任务完成。
 
 ### 16.17 EXU/DAG/TSN 基础切片验证记录
 
@@ -1716,7 +1723,7 @@ DocumentSnapshot 现在区分模型树投影与 `DocumentObjectSnapshot` 真值
 
 尚未完成的 TSN 工作：OCCT `Generated/Modified/Deleted` 历史捕获、跨布尔/特征的真实拓扑映射、面/边/顶点统一命名、附着和 `TopoRef` 文件迁移。当前签名是可审计的基础候选层，不能单独宣称 FreeCAD 稳定拓扑命名已完成。
 
-Sketcher 当前边界：基础适配器支持点/线/圆/弧、Coincident/Horizontal/Vertical/Distance/Radius/Angle/Equal/Block 的确定性约束处理；完整 FreeCAD `planegcs` 数值求解、冗余约束分类、B-spline、外部几何、自动约束和拖拽交互仍需 SK-03、SK-07、SK-09、SK-10 的 WASM/浏览器回放门禁。
+Sketcher 当前边界：基础适配器支持点/线/圆/弧、Coincident/Horizontal/Vertical/Distance/Radius/Diameter/Angle/Equal/Symmetric/Tangent/Block 的确定性约束处理；完整 FreeCAD `planegcs` 数值求解、冗余约束分类、B-spline、外部几何、自动约束和拖拽交互仍需 SK-03、SK-07、SK-09、SK-10 的 WASM/浏览器回放门禁。
 
 ### 16.16 引擎版本修复与完整 FreeCAD 对标专项
 

package-lock.json

@@ -11,6 +11,8 @@
         "@bitbybit-dev/occt": "1.1.1",
         "@bitbybit-dev/occt-worker": "1.1.1",
         "@sqlite.org/sqlite-wasm": "3.53.0-build1",
+        "fast-xml-parser": "^5.10.1",
+        "fflate": "^0.8.3",
         "lucide-react": "^0.468.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
@@ -809,6 +811,18 @@
         "node": "^22.20 || ^24.12 || >=25"
       }
     },
+    "node_modules/@nodable/entities": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@nodable/entities/-/entities-3.0.0.tgz",
+      "integrity": "sha512-8L9xFeTYKhm49xfIypoe2W5wV1m/3Z58kT+7kR9A8OyFxcPduI4VmxaUMQyKYrRjUoLLSXv6EKKID5Tvj9cUVw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/nodable"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -1272,6 +1286,18 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/anynum": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/anynum/-/anynum-1.0.1.tgz",
+      "integrity": "sha512-N6//FLET/tXYNM/F6ABca1oH6fWB+KlTt909Le28WMDBk8oaT4vY17DCrwg2MvmuqUKt3Ni4N5dGJ/EoBgcO6A==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/baseline-browser-mapping": {
       "version": "2.11.10",
       "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.10.tgz",
@@ -1422,6 +1448,45 @@
         "node": ">=6"
       }
     },
+    "node_modules/fast-xml-builder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/fast-xml-builder/-/fast-xml-builder-1.3.0.tgz",
+      "integrity": "sha512-F74cZEdCvuw9P41GAC3rod4X04jjWGM1JPEv/GWSqFTWLsdyMSBMBMlm9Hk3GLBgLBbdBNY8yee0pQh2RBVESQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "path-expression-matcher": "^1.6.2",
+        "xml-naming": "^0.3.0"
+      }
+    },
+    "node_modules/fast-xml-parser": {
+      "version": "5.10.1",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.10.1.tgz",
+      "integrity": "sha512-IEMIf7298kXuZSRFoGfMYrl7is8LpavODgbNz1cwIudv7KwVFnuU+UsMporfq6PD6aXSlawZlARiA3UywCTfMw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@nodable/entities": "^3.0.0",
+        "fast-xml-builder": "^1.2.0",
+        "is-unsafe": "^2.0.0",
+        "path-expression-matcher": "^1.6.2",
+        "strnum": "^2.4.1",
+        "xml-naming": "^0.3.0"
+      },
+      "bin": {
+        "fxparser": "src/cli/cli.js"
+      }
+    },
     "node_modules/fdir": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
@@ -1443,7 +1508,7 @@
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.8.3.tgz",
       "integrity": "sha512-tbZNuJrLwGUp3zshBtdy4W+ORxZuIh8a5ilyIEQDC5rY1f3U20JMry0Ll3WBzU58EZKsEuJFXhb5gwv8CsPvgA==",
-      "dev": true
+      "license": "MIT"
     },
     "node_modules/fsevents": {
       "version": "2.3.3",
@@ -1468,6 +1533,18 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/is-unsafe": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/is-unsafe/-/is-unsafe-2.0.0.tgz",
+      "integrity": "sha512-2LdV822R+wmI86unXA93WCFpL6g+av8ynWk0nrHyJqGop5VoocYsSLFgN8jrfalT6iGeLNM4KXuVSsULP53kEA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -1564,6 +1641,21 @@
         "node": ">=18"
       }
     },
+    "node_modules/path-expression-matcher": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/path-expression-matcher/-/path-expression-matcher-1.6.2.tgz",
+      "integrity": "sha512-enSlaiat05iasnzmgNxRj8reFdj3puY2QpNgP1aPIaVfT6nn9ICuPoFlKHk8EN22HcwewshO+mN2DGbkCEOtqQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
@@ -1721,6 +1813,21 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/strnum": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.4.1.tgz",
+      "integrity": "sha512-M9eUSMT2dCB2cTNPG7UYj6KuK7RJR2SN2+yCV/fTW3xzTCS6EaGZ5pSMgDIjB7r8zSfTGk+dvvn9rTjpVS9Mwg==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "anynum": "^1.0.1"
+      }
+    },
     "node_modules/three": {
       "version": "0.185.1",
       "resolved": "https://registry.npmjs.org/three/-/three-0.185.1.tgz",
@@ -2339,6 +2446,21 @@
         }
       }
     },
+    "node_modules/xml-naming": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/xml-naming/-/xml-naming-0.3.0.tgz",
+      "integrity": "sha512-ghig2TBE/H11aOVgmahA3MhimvkBr6JIYknH/Dhdk10nXwdbIqBJsbfMxpvFPG8bAw77gN29aQWvKpmVoPlvPQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",

package.json

@@ -20,6 +20,8 @@
     "@bitbybit-dev/occt": "1.1.1",
     "@bitbybit-dev/occt-worker": "1.1.1",
     "@sqlite.org/sqlite-wasm": "3.53.0-build1",
+    "fast-xml-parser": "5.10.1",
+    "fflate": "0.8.3",
     "lucide-react": "^0.468.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

src/App.tsx

@@ -45,6 +45,7 @@ import {
   Trash2,
   Undo2,
   Redo2,
+  RefreshCw,
   Upload,
   UserRound,
   WandSparkles,
@@ -53,7 +54,7 @@ import {
   ZoomOut,
 } from 'lucide-react'
 import { menuDefinitions, pinnedWorkbenches, workbenchDefinitions, type MenuName, type WorkbenchId } from './freecadManifest'
-import { createMockFacade, type BitBybitViewportAdapter, type BitBybitWebCadFacade, type DocumentSnapshot, type ModelTreeItem, type ObjectPropertySnapshot, type PropertyValue, type ShapeHandle } from './facade'
+import { createMockFacade, type BitBybitViewportAdapter, type BitBybitWebCadFacade, type DocumentSnapshot, type FcstdInspection, type ModelTreeItem, type ObjectPropertySnapshot, type ProjectSummary, type PropertyValue, type ShapeHandle } from './facade'
 
 type Page = 'start' | 'projects' | 'workspace' | 'import' | 'export' | 'settings' | 'help' | 'diagnostics' | 'sync'
 type Workbench = WorkbenchId
@@ -135,6 +136,11 @@ function App() {
     }
   }), [facade])
 
+  useEffect(() => facade.project.subscribeExternalChanges((notice) => {
+    setNotice(`Project saved in another tab · v${notice.documentVersion}`)
+    window.setTimeout(() => setNotice(''), 2600)
+  }), [facade])
+
   useEffect(() => () => facade.geometry.dispose(), [facade])
 
   useEffect(() => {
@@ -175,6 +181,7 @@ function App() {
       {page === 'workspace' ? (
         <Workspace
           workbench={workbench}
+          onNavigate={navigate}
           setWorkbench={(value) => { setWorkbench(value); setLeftTab('tasks') }}
           leftTab={leftTab}
           setLeftTab={setLeftTab}
@@ -190,7 +197,7 @@ function App() {
           showNotice={showNotice}
         />
       ) : (
-        <PageFrame page={page} onNavigate={navigate} onOpenWorkspace={openWorkspace} showNotice={showNotice} />
+        <PageFrame page={page} onNavigate={navigate} onOpenWorkspace={openWorkspace} showNotice={showNotice} facade={facade} />
       )}
       {notice && <div className="toast"><CheckCircle2 size={16} />{notice}</div>}
     </div>
@@ -199,6 +206,7 @@ function App() {
 
 function TopBar({ page, workbench, facade, onNavigate, onOpenWorkspace }: { page: Page; workbench: Workbench; facade: BitBybitWebCadFacade; onNavigate: (page: Page) => void; onOpenWorkspace: () => void }) {
   const [openMenu, setOpenMenu] = useState<MenuName | null>(null)
+  const document = facade.getState().document
   const handleMenuCommand = (command: string) => {
     setOpenMenu(null)
     if (command === 'help' || command === 'shortcuts') onNavigate('help')
@@ -220,8 +228,8 @@ function TopBar({ page, workbench, facade, onNavigate, onOpenWorkspace }: { page
       </nav>
       <div className="topbar-spacer" />
       <div className="topbar-context">
-        <div className="context-document"><span className="context-dot" />Pump Housing <span className="context-separator">/</span> {workbench}</div>
-        <span className="save-state"><span className="save-dot" />Unsaved changes</span>
+        <div className="context-document"><span className="context-dot" />{document.label} <span className="context-separator">/</span> {workbench}</div>
+        <span className="save-state"><span className="save-dot" />{document.dirty ? 'Unsaved changes' : 'Saved locally'}</span>
       </div>
       <IconButton icon={Undo2} label="Undo" onClick={() => facade.history.undo()} disabled={!facade.history.canUndo()} />
       <IconButton icon={Redo2} label="Redo" onClick={() => facade.history.redo()} disabled={!facade.history.canRedo()} />
@@ -233,8 +241,9 @@ function TopBar({ page, workbench, facade, onNavigate, onOpenWorkspace }: { page
   )
 }
 
-function Workspace({ workbench, setWorkbench, leftTab, setLeftTab, rightTab, setRightTab, bottomOpen, setBottomOpen, selectedObject, setSelectedObject, document, facade, workbenchIcon: WorkbenchIcon, showNotice }: {
+function Workspace({ workbench, onNavigate, setWorkbench, leftTab, setLeftTab, rightTab, setRightTab, bottomOpen, setBottomOpen, selectedObject, setSelectedObject, document, facade, workbenchIcon: WorkbenchIcon, showNotice }: {
   workbench: Workbench
+  onNavigate: (page: Page) => void
   setWorkbench: (value: Workbench) => void
   leftTab: 'model' | 'tasks'
   setLeftTab: (tab: 'model' | 'tasks') => void
@@ -255,8 +264,9 @@ function Workspace({ workbench, setWorkbench, leftTab, setLeftTab, rightTab, set
         <div className="workbench-picker"><WorkbenchIcon size={17} /><select value={workbench} onChange={(event) => setWorkbench(event.target.value as Workbench)} aria-label="Workbench">{Object.keys(workbenchDefinitions).map((option) => <option key={option}>{option}</option>)}</select><ChevronDown size={14} /></div>
         <div className="toolbar-divider" />
         <IconButton icon={FilePlus2} label="New document" onClick={() => { facade.gui.command.execute({ commandId: 'new-document' }); showNotice('New document prepared') }} />
-        <IconButton icon={FolderOpen} label="Open project" onClick={() => showNotice('Project browser opened')} />
+        <IconButton icon={FolderOpen} label="Open project" onClick={() => onNavigate('projects')} />
         <IconButton icon={Save} label="Save project" onClick={() => { facade.gui.command.execute({ commandId: 'save' }); showNotice('Saved to local workspace') }} />
+        <IconButton icon={RefreshCw} label="Recompute document" disabled={document.readOnly} onClick={() => { void facade.app.document.recomputeAsync().then((result) => showNotice(result.status === 'completed' ? 'Recompute completed' : `Recompute ${result.status}`)) }} />
         <div className="toolbar-divider" />
         <IconButton icon={Box} label="Create body" onClick={() => { facade.gui.command.execute({ commandId: 'create-body' }); showNotice('Create Body task opened') }} active={workbench === 'Part Design'} />
         <IconButton icon={CircleDot} label="Create sketch" onClick={() => { facade.gui.command.execute({ commandId: 'create-sketch' }); showNotice('Select a plane to create a sketch') }} />
@@ -269,11 +279,11 @@ function Workspace({ workbench, setWorkbench, leftTab, setLeftTab, rightTab, set
       </div>
       <WorkbenchNavBar workbench={workbench} setWorkbench={setWorkbench} showNotice={showNotice} />
       <div className="document-tabs">
-        <button className="doc-tab is-active"><FileBox size={15} /><span>Pump Housing</span><span className="doc-unsaved" /><X size={13} /></button>
+        <button className="doc-tab is-active"><FileBox size={15} /><span>{document.label}</span>{document.dirty && <span className="doc-unsaved" />}<X size={13} /></button>
         <button className="doc-tab" onClick={() => showNotice('Open Mounting Bracket') }><FileBox size={15} /><span>Mounting Bracket</span><X size={13} /></button>
         <button className="new-tab" title="New document"><Plus size={16} /></button>
         <div className="document-tab-spacer" />
-        <span className="document-meta">mm · 18 objects · v0.1 draft</span>
+        <span className="document-meta">{document.units} · {document.objects.length} objects · v{document.version}</span>
       </div>
       <div className="workspace-content">
         <aside className="combo-panel left-panel">
@@ -281,7 +291,7 @@ function Workspace({ workbench, setWorkbench, leftTab, setLeftTab, rightTab, set
           {leftTab === 'model' ? <div className="combo-model"><ModelTree document={document} selectedObject={selectedObject} setSelectedObject={setSelectedObject} showNotice={showNotice} /><div className="combo-property"><div className="property-heading"><div><span className="eyebrow">Property view</span><h2>{document.tree.find((item) => item.id === selectedObject)?.label || 'No selection'}</h2></div><IconButton icon={MoreHorizontal} label="More object actions" /></div><div className="panel-tabs property-tabs"><button className={rightTab === 'data' ? 'is-active' : ''} onClick={() => setRightTab('data')}>Data</button><button className={rightTab === 'view' ? 'is-active' : ''} onClick={() => setRightTab('view')}>View</button></div><PropertyPanel key={rightTab} facade={facade} objectId={selectedObject} scope={rightTab} showNotice={showNotice} /></div></div> : <div className="model-task-summary"><span className="eyebrow">Combo View task tab</span><p>Use the right Task panel for command parameters. This tab stays available for selection and dependency context.</p><button className="button button-outline" onClick={() => showNotice('Selection filter enabled')}><Search size={14} />Selection filter</button></div>}
         </aside>
         <section className="viewport-region">
-          <Viewport selectedObject={selectedObject} setSelectedObject={setSelectedObject} workbench={workbench} facade={facade} showNotice={showNotice} />
+          <Viewport selectedObject={selectedObject} setSelectedObject={setSelectedObject} workbench={workbench} facade={facade} documentVersion={document.version} recomputeGeneration={document.recompute?.generation ?? 0} showNotice={showNotice} />
           <div className="viewport-bottom-left"><div className="view-chip"><Circle size={8} fill="currentColor" /> Perspective</div><div className="view-chip">Grid 10 mm</div></div>
           <div className="viewport-bottom-right"><div className="axis-widget"><span className="axis-x">X</span><span className="axis-y">Y</span><span className="axis-z">Z</span><div className="axis-origin" /></div></div>
         </section>
@@ -290,7 +300,7 @@ function Workspace({ workbench, setWorkbench, leftTab, setLeftTab, rightTab, set
       </div>
       <div className={`bottom-drawer ${bottomOpen ? 'is-open' : ''}`}>
         <div className="bottom-drawer-header"><div className="drawer-tabs"><button className="is-active"><PanelBottom size={14} />Report view <span className="tab-count">2</span></button><button><Clock3 size={14} />Jobs <span className="tab-count tab-count-green">1</span></button><button><Code2 size={14} />Diagnostics</button></div><button className="drawer-toggle" onClick={() => setBottomOpen(!bottomOpen)} title={bottomOpen ? 'Collapse bottom panel' : 'Expand bottom panel'}>{bottomOpen ? <ChevronDown size={15} /> : <ChevronRight size={15} />}</button></div>
-        {bottomOpen && <div className="bottom-drawer-content"><div className="report-line"><CheckCircle2 size={14} className="icon-green" /><span>Recompute completed</span><span className="report-context">Document / Body / Fillet</span><span className="report-time">142 ms</span></div><div className="report-line"><AlertTriangle size={14} className="icon-amber" /><span>Reference face may change after Pocket edit</span><button onClick={() => showNotice('Dependency review opened')}>Review dependency</button><span className="report-time">just now</span></div></div>}
+        {bottomOpen && <div className="bottom-drawer-content"><div className="report-line">{document.recompute?.status === 'failed' ? <AlertTriangle size={14} className="icon-amber" /> : <CheckCircle2 size={14} className="icon-green" />}<span>Recompute {document.recompute?.status || 'idle'}</span><span className="report-context">{document.recompute?.order.length || 0} objects in plan</span><span className="report-time">generation {document.recompute?.generation || 0}</span></div>{(document.recompute?.errors || []).slice(0, 2).map((error) => <div className="report-line" key={`${error.objectId}-${error.code}`}><AlertTriangle size={14} className="icon-amber" /><span>{error.message}</span><button onClick={() => showNotice(`Dependency review: ${error.objectId}`)}>Review dependency</button><span className="report-time">{error.code}</span></div>)}</div>}
       </div>
     </main>
   )
@@ -337,7 +347,31 @@ function TreeItem({ item, level, expanded, onToggle, itemsById, selectedObject,
 function TaskPanel({ workbench, facade, showNotice }: { workbench: Workbench; facade: BitBybitWebCadFacade; showNotice: (message: string) => void }) {
   const definition = workbenchDefinitions[workbench]
   const isSketch = workbench === 'Sketcher'
-  return <div className="task-panel"><div className="task-actions-top"><button className="button button-primary" onClick={() => { facade.task.apply(); showNotice('Task accepted') }}>OK</button><button className="button button-outline" onClick={() => { facade.task.update({ preview: true }); showNotice('Preview applied') }}>Apply</button><button className="button button-quiet" onClick={() => { facade.task.cancel(); showNotice('Task cancelled') }}>Cancel</button></div><div className="task-header"><div className="task-icon"><Pencil size={16} /></div><div><span className="eyebrow">Active command</span><h2>{isSketch ? 'Edit Sketch' : definition.taskTitle}</h2></div><Badge tone="cyan">Preview</Badge></div><div className="task-body"><div className="task-step"><span className="step-index">1</span><div><strong>{isSketch ? 'Geometry and constraints' : definition.objectType}</strong><span>{definition.taskSummary}</span></div></div><label className="field-label">Primary value <span className="field-unit">mm</span><input className="field-input" value={isSketch ? 'Fully constrained' : '42.00'} readOnly /></label><label className="field-label">Operation<select className="field-input"><option>{workbench === 'Part Design' ? 'Dimension' : 'Contextual preview'}</option><option>Through all</option><option>Up to face</option></select></label><label className="check-row"><input type="checkbox" defaultChecked /><span>Preview result in viewport</span></label><div className="task-note"><AlertTriangle size={14} /><span>Changes remain local until the document is recomputed.</span></div></div></div>
+  const activeTask = facade.task.getActive()
+  const primitiveType = activeTask?.commandId === 'primitive' && typeof activeTask.draft.primitiveType === 'string' ? activeTask.draft.primitiveType : 'Box'
+  const primitiveFields = primitiveType === 'Box' ? ['width', 'length', 'height'] : primitiveType === 'Cylinder' ? ['radius', 'height', 'angle'] : primitiveType === 'Sphere' ? ['radius'] : ['radius1', 'radius2', 'height', 'angle']
+  const primitiveUnits: Record<string, string> = { width: 'mm', length: 'mm', height: 'mm', radius: 'mm', radius1: 'mm', radius2: 'mm', angle: 'deg' }
+  const primitiveFallbacks: Record<string, number> = { width: 10, length: 10, height: 10, radius: 5, radius1: 5, radius2: 0, angle: 360 }
+  const primitiveLabel = (field: string) => field === 'radius1' ? 'Bottom radius' : field === 'radius2' ? 'Top radius' : field[0].toUpperCase() + field.slice(1)
+  const featureFields: Record<string, { key: string; label: string; unit: string; fallback: number }> = {
+    pad: { key: 'length', label: 'Length', unit: 'mm', fallback: 42 },
+    pocket: { key: 'length', label: 'Length', unit: 'mm', fallback: 18 },
+    revolution: { key: 'angle', label: 'Angle', unit: 'deg', fallback: 360 },
+    fillet: { key: 'radius', label: 'Radius', unit: 'mm', fallback: 3 },
+    chamfer: { key: 'distance', label: 'Distance', unit: 'mm', fallback: 2 },
+  }
+  const currentFeatureField = activeTask?.commandId ? featureFields[activeTask.commandId] : undefined
+  const activeCommand = activeTask?.commandId
+  const activeDocument = facade.app.document.getActive()
+  const booleanCommand = activeCommand === 'union' || activeCommand === 'cut' || activeCommand === 'intersection'
+  const shapeObjects = activeDocument.objects.filter((object) => object.typeId.startsWith('Part::') || ['PartDesign::Feature', 'PartDesign::Pad', 'PartDesign::Pocket', 'PartDesign::Revolution', 'PartDesign::Fillet', 'PartDesign::Chamfer'].includes(object.typeId))
+  const draftLink = (name: string) => typeof activeTask?.draft[name] === 'string' ? String(activeTask.draft[name]) : ''
+  const acceptTask = () => {
+    if (!activeTask || activeTask.status !== 'preview') { showNotice('No active task'); return }
+    facade.task.apply()
+    void facade.app.document.recomputeAsync().then((result) => showNotice(result.status === 'completed' ? 'Task accepted and recompute completed' : `Task accepted; recompute ${result.status}`))
+  }
+  return <div className="task-panel"><div className="task-actions-top"><button className="button button-primary" onClick={acceptTask}>OK</button><button className="button button-outline" onClick={() => { facade.task.update({ preview: true }); showNotice('Preview applied') }}>Apply</button><button className="button button-quiet" onClick={() => { facade.task.cancel(); showNotice('Task cancelled') }}>Cancel</button></div><div className="task-header"><div className="task-icon"><Pencil size={16} /></div><div><span className="eyebrow">Active command</span><h2>{isSketch ? 'Edit Sketch' : definition.taskTitle}</h2></div><Badge tone="cyan">Preview</Badge></div><div className="task-body"><div className="task-step"><span className="step-index">1</span><div><strong>{isSketch ? 'Geometry and constraints' : definition.objectType}</strong><span>{definition.taskSummary}</span></div></div>{activeCommand === 'primitive' && <><label className="field-label">Primitive type<select className="field-input" value={primitiveType} onChange={(event) => facade.task.update({ primitiveType: event.target.value })}><option>Box</option><option>Cylinder</option><option>Sphere</option><option>Cone</option></select></label>{primitiveFields.map((field) => <label className="field-label" key={field}>{primitiveLabel(field)} <span className="field-unit">{primitiveUnits[field]}</span><input className="field-input" type="number" min={field === 'radius2' ? 0 : 0.001} max={primitiveUnits[field] === 'deg' ? 360 : undefined} step={primitiveUnits[field] === 'deg' ? 1 : 0.1} value={typeof activeTask?.draft[field] === 'number' ? Number(activeTask?.draft[field]) : primitiveFallbacks[field]} onChange={(event) => facade.task.update({ [field]: Number(event.target.value) })} /></label>)}</>}{booleanCommand && <><label className="field-label">Base<select className="field-input" value={draftLink('base')} onChange={(event) => facade.task.update({ base: event.target.value })}><option value="">Select base</option>{shapeObjects.map((object) => <option value={object.id} key={object.id}>{object.properties.find((property) => property.name === 'Label')?.value || object.id}</option>)}</select></label><label className="field-label">Tool<select className="field-input" value={draftLink('tool')} onChange={(event) => facade.task.update({ tool: event.target.value })}><option value="">Select tool</option>{shapeObjects.map((object) => <option value={object.id} key={object.id}>{object.properties.find((property) => property.name === 'Label')?.value || object.id}</option>)}</select></label></>}{currentFeatureField && <label className="field-label">{currentFeatureField.label} <span className="field-unit">{currentFeatureField.unit}</span><input className="field-input" type="number" min={0.001} max={currentFeatureField.unit === 'deg' ? 360 : undefined} step={currentFeatureField.unit === 'deg' ? 1 : 0.1} value={typeof activeTask?.draft[currentFeatureField.key] === 'number' ? Number(activeTask?.draft[currentFeatureField.key]) : currentFeatureField.fallback} onChange={(event) => facade.task.update({ [currentFeatureField.key]: Number(event.target.value) })} /></label>}{activeCommand === 'pocket' && <label className="field-label">Type<select className="field-input" value={typeof activeTask?.draft.type === 'string' ? activeTask.draft.type : 'Through all'} onChange={(event) => facade.task.update({ type: event.target.value })}><option>Dimension</option><option>Through all</option><option>Up to face</option></select></label>}{['pad', 'pocket', 'revolution'].includes(activeCommand || '') && <label className="check-row"><input type="checkbox" checked={activeTask?.draft.reversed === true} onChange={(event) => facade.task.update({ reversed: event.target.checked })} /><span>Reversed</span></label>}{activeCommand === 'pad' && <label className="check-row"><input type="checkbox" checked={activeTask?.draft.midplane === true} onChange={(event) => facade.task.update({ midplane: event.target.checked })} /><span>Symmetric to plane</span></label>}{!activeCommand || activeCommand === 'create-sketch' ? <><label className="field-label">Primary value <span className="field-unit">mm</span><input className="field-input" value={isSketch ? 'Fully constrained' : '42.00'} readOnly /></label><label className="field-label">Operation<select className="field-input"><option>{workbench === 'Part Design' ? 'Dimension' : 'Contextual preview'}</option><option>Through all</option><option>Up to face</option></select></label></> : null}<label className="check-row"><input type="checkbox" defaultChecked /><span>Preview result in viewport</span></label><div className="task-note"><AlertTriangle size={14} /><span>Changes remain local until the document is recomputed.</span></div></div></div>
 }
 
 function PropertyPanel({ facade, objectId, scope, showNotice }: { facade: BitBybitWebCadFacade; objectId: string; scope: 'data' | 'view'; showNotice: (message: string) => void }) {
@@ -369,12 +403,12 @@ function PropertyEditor({ facade, objectId, property, showNotice }: { facade: Bi
     const ids = [...new Set(document.tree.flatMap((item) => [item.id, ...(item.children ?? [])]))]
     editor = <select className="property-control property-link-control" value={String(property.value ?? '')} aria-label={property.label} onChange={(event) => commit(event.target.value || null)}><option value="">None</option>{ids.filter((id) => id !== objectId).map((id) => <option value={id} key={id}>{document.tree.find((item) => item.id === id)?.label ?? id}</option>)}</select>
   } else if (property.type === 'App::PropertyColor') editor = <label className="property-color"><input type="color" value={String(property.value)} aria-label={property.label} onChange={(event) => commit(event.target.value)} /><span>{String(property.value).toUpperCase()}</span></label>
-  else if (property.type === 'App::PropertyLength' || property.type === 'App::PropertyPercent' || property.type === 'App::PropertyFloat') editor = <label className="property-number"><input className="property-control" type="number" defaultValue={Number(property.value)} min={property.type === 'App::PropertyLength' || property.type === 'App::PropertyPercent' ? 0 : undefined} max={property.type === 'App::PropertyPercent' ? 100 : undefined} step={property.type === 'App::PropertyLength' ? 0.1 : 1} aria-label={property.label} onBlur={(event) => { if (!commit(Number(event.target.value))) event.target.value = String(property.value) }} onKeyDown={(event) => { if (event.key === 'Enter') event.currentTarget.blur() }} /><span>{property.unit}</span></label>
+  else if (property.type === 'App::PropertyLength' || property.type === 'App::PropertyAngle' || property.type === 'App::PropertyPercent' || property.type === 'App::PropertyFloat') editor = <label className="property-number"><input className="property-control" type="number" defaultValue={Number(property.value)} min={property.type === 'App::PropertyLength' || property.type === 'App::PropertyAngle' || property.type === 'App::PropertyPercent' ? 0 : undefined} max={property.type === 'App::PropertyAngle' ? 360 : property.type === 'App::PropertyPercent' ? 100 : undefined} step={property.type === 'App::PropertyLength' ? 0.1 : 1} aria-label={property.label} onBlur={(event) => { if (!commit(Number(event.target.value))) event.target.value = String(property.value) }} onKeyDown={(event) => { if (event.key === 'Enter') event.currentTarget.blur() }} /><span>{property.unit}</span></label>
   else editor = <input className="property-control" defaultValue={String(property.value ?? '')} aria-label={property.label} onBlur={(event) => { if (!commit(event.target.value)) event.target.value = String(property.value ?? '') }} onKeyDown={(event) => { if (event.key === 'Enter') event.currentTarget.blur() }} />
   return <><div className="property-row"><span className="property-label">{property.label}</span><div className="property-editor">{editor}</div></div>{property.expression && <div className="property-expression"><Code2 size={12} /><span>{property.expression}</span></div>}</>
 }
 
-function Viewport({ selectedObject, setSelectedObject, workbench, facade, showNotice }: { selectedObject: string; setSelectedObject: (id: string) => void; workbench: Workbench; facade: BitBybitWebCadFacade; showNotice: (message: string) => void }) {
+function Viewport({ selectedObject, setSelectedObject, workbench, facade, documentVersion, recomputeGeneration, showNotice }: { selectedObject: string; setSelectedObject: (id: string) => void; workbench: Workbench; facade: BitBybitWebCadFacade; documentVersion: number; recomputeGeneration: number; showNotice: (message: string) => void }) {
   const hostRef = useRef<HTMLDivElement>(null)
   const adapterRef = useRef<BitBybitViewportAdapter | null>(null)
   useEffect(() => {
@@ -383,7 +417,8 @@ function Viewport({ selectedObject, setSelectedObject, workbench, facade, showNo
     const adapter = facade.viewport.createAdapter()
     adapterRef.current = adapter
     let cancelled = false
-    let shape: ShapeHandle | null = null
+    const shapes: ShapeHandle[] = []
+    let ownsShapes = false
     try {
       adapter.mount(host)
     } catch (error) {
@@ -396,13 +431,25 @@ function Viewport({ selectedObject, setSelectedObject, workbench, facade, showNo
       const capabilities = await facade.geometry.initialize()
       if (capabilities.status !== 'ready') throw new Error(capabilities.reason || 'OCCT geometry runtime unavailable')
       const document = facade.app.document.getActive()
-      shape = await facade.geometry.createBox({ width: 2.7, length: 1.4, height: 1.6, center: [0, 0, 0], originOnCenter: true, documentId: document.id, documentVersion: document.version })
-      if (cancelled) {
-        await facade.geometry.release(shape)
-        shape = null
+      const featureIds = [selectedObject, 'fillet', 'chamfer', 'revolution', 'intersection', 'cut', 'union', 'pocket', 'pad', 'box', 'cylinder', 'sphere', 'cone'].filter(Boolean)
+      const storedShape = featureIds.map((objectId) => facade.geometry.getObjectShape(objectId)).find((shape): shape is ShapeHandle => Boolean(shape))
+      if (storedShape) {
+        const mesh = await facade.geometry.mesh(storedShape, 0.05)
+        if (!cancelled) adapter.setMesh(mesh)
         return
       }
-      const mesh = await facade.geometry.mesh(shape, 0.05)
+      ownsShapes = true
+      const profile = { outer: [[-1.35, -0.7, 0], [1.35, -0.7, 0], [1.35, 0.7, 0], [-1.35, 0.7, 0]] as [number, number, number][] }
+      const pad = await facade.geometry.pad({ profile, length: 1.6, direction: [0, 0, 1], documentId: document.id, documentVersion: document.version })
+      shapes.push(pad)
+      const pocketProfile = { outer: [[-0.55, -0.32, 0], [0.55, -0.32, 0], [0.55, 0.32, 0], [-0.55, 0.32, 0]] as [number, number, number][] }
+      const pocket = await facade.geometry.pocket({ base: pad, profile: pocketProfile, length: 1.8, direction: [0, 0, 1], documentId: document.id, documentVersion: document.version })
+      shapes.push(pocket)
+      if (cancelled) {
+        await Promise.all(shapes.map((entry) => facade.geometry.release(entry)))
+        return
+      }
+      const mesh = await facade.geometry.mesh(pocket, 0.05)
       if (!cancelled) adapter.setMesh(mesh)
     }
     void loadGeometry().catch((error: unknown) => {
@@ -410,25 +457,25 @@ function Viewport({ selectedObject, setSelectedObject, workbench, facade, showNo
     })
     return () => {
       cancelled = true
-      if (shape) void facade.geometry.release(shape)
+      if (ownsShapes) void Promise.all(shapes.map((entry) => facade.geometry.release(entry)))
       adapter.dispose()
       adapterRef.current = null
     }
-  }, [facade, showNotice])
+  }, [facade, showNotice, selectedObject, documentVersion, recomputeGeneration])
 
   useEffect(() => adapterRef.current?.setSelection(selectedObject), [selectedObject])
   return <div className="viewport"><div className="viewport-header"><div className="viewport-title"><span className="eyebrow">{workbench}</span><strong>Body / Fillet</strong></div><div className="viewport-actions"><IconButton icon={ZoomOut} label="Zoom out" /><IconButton icon={ZoomIn} label="Zoom in" /><IconButton icon={Rotate3D} label="Orbit view" active /></div></div><div className="viewport-grid" onClick={() => setSelectedObject('')}><div className="three-viewport-host" ref={hostRef} aria-label="Three.js viewport" /></div><div className="viewport-legend"><span><span className="legend-swatch selected" />Selected</span><span><span className="legend-swatch edge" />Edges</span><span><span className="legend-swatch datum" />Datum</span></div></div>
 }
 
-function PageFrame({ page, onNavigate, onOpenWorkspace, showNotice }: { page: Page; onNavigate: (page: Page) => void; onOpenWorkspace: () => void; showNotice: (message: string) => void }) {
+function PageFrame({ page, onNavigate, onOpenWorkspace, showNotice, facade }: { page: Page; onNavigate: (page: Page) => void; onOpenWorkspace: () => void; showNotice: (message: string) => void; facade: BitBybitWebCadFacade }) {
   const pages: Record<Exclude<Page, 'workspace'>, ReactNode> = {
     start: <StartPage onNavigate={onNavigate} onOpenWorkspace={onOpenWorkspace} showNotice={showNotice} />,
-    projects: <ProjectsPage onNavigate={onNavigate} onOpenWorkspace={onOpenWorkspace} showNotice={showNotice} />,
-    import: <FileFlowPage mode="import" onNavigate={onNavigate} showNotice={showNotice} />,
-    export: <FileFlowPage mode="export" onNavigate={onNavigate} showNotice={showNotice} />,
+    projects: <ProjectsPage onNavigate={onNavigate} onOpenWorkspace={onOpenWorkspace} showNotice={showNotice} facade={facade} />,
+    import: <FileFlowPage mode="import" onNavigate={onNavigate} showNotice={showNotice} facade={facade} />,
+    export: <FileFlowPage mode="export" onNavigate={onNavigate} showNotice={showNotice} facade={facade} />,
     settings: <SettingsPage onNavigate={onNavigate} showNotice={showNotice} />,
     help: <HelpPage onNavigate={onNavigate} showNotice={showNotice} />,
-    diagnostics: <DiagnosticsPage onNavigate={onNavigate} showNotice={showNotice} />,
+    diagnostics: <DiagnosticsPage onNavigate={onNavigate} showNotice={showNotice} facade={facade} />,
     sync: <SyncPage onNavigate={onNavigate} showNotice={showNotice} />,
   }
   return <div className="page-shell"><div className="page-content">{pages[page as Exclude<Page, 'workspace'>]}</div></div>
@@ -455,13 +502,58 @@ function ProjectCard({ project, index, onClick }: { project: typeof projects[num
   return <button className="project-card" onClick={onClick}><div className={`project-preview preview-${index}`}><div className="preview-shape" /><div className="preview-grid" /></div><div className="project-card-info"><div className="project-card-title"><strong>{project.name}</strong><MoreHorizontal size={15} /></div><span>{project.path}</span><div className="project-card-meta"><span>{project.modified}</span><span>{project.objects} objects</span><Badge tone={project.state === 'Unsaved' ? 'amber' : project.state === 'Read only' ? 'muted' : 'green'}>{project.state}</Badge></div></div></button>
 }
 
-function ProjectsPage({ onNavigate, onOpenWorkspace, showNotice }: { onNavigate: (page: Page) => void; onOpenWorkspace: () => void; showNotice: (message: string) => void }) {
-  return <div className="projects-page"><PageHeader eyebrow="Project manager" title="Your projects." description="Local-first project storage with explicit save and recovery states." actions={<><button className="button button-outline" onClick={() => onNavigate('import')}><Upload size={16} />Import</button><button className="button button-primary" onClick={onOpenWorkspace}><Plus size={16} />New project</button></>} /><div className="manager-toolbar"><div className="large-search"><Search size={16} /><input placeholder="Search projects" /><kbd>/</kbd></div><div className="toolbar-select"><span>Sort by</span><select><option>Last modified</option><option>Name</option><option>Object count</option></select><ChevronDown size={14} /></div><IconButton icon={LayoutGrid} label="Grid view" active /><IconButton icon={ListTree} label="List view" /></div><div className="project-list">{projects.map((project, index) => <div className="project-list-row" key={project.name}><div className={`list-thumbnail preview-${index}`}><div className="preview-shape" /><div className="preview-grid" /></div><div className="list-main"><strong>{project.name}</strong><span>{project.path}</span></div><span className="list-count">{project.objects} objects</span><span className="list-modified">{project.modified}</span><Badge tone={project.state === 'Unsaved' ? 'amber' : project.state === 'Read only' ? 'muted' : 'green'}>{project.state}</Badge><button className="row-action" title="More project actions" onClick={() => showNotice(`Actions for ${project.name}`)}><MoreHorizontal size={16} /></button></div>)}</div><div className="storage-banner"><div className="storage-icon"><HardDrive size={18} /></div><div><strong>Local storage</strong><span>3.4 GB of 10 GB used · Last backup just now</span></div><button className="text-button" onClick={() => onNavigate('settings')}>Manage storage <ArrowRight size={14} /></button></div></div>
+function ProjectsPage({ onNavigate, onOpenWorkspace, showNotice, facade }: { onNavigate: (page: Page) => void; onOpenWorkspace: () => void; showNotice: (message: string) => void; facade: BitBybitWebCadFacade }) {
+  const [savedProjects, setSavedProjects] = useState<ProjectSummary[]>([])
+  const [loading, setLoading] = useState(true)
+  useEffect(() => {
+    let cancelled = false
+    void facade.project.list().then((items) => { if (!cancelled) setSavedProjects(items) }).catch((error: unknown) => { if (!cancelled) showNotice(`Project list unavailable: ${error instanceof Error ? error.message : String(error)}`) }).finally(() => { if (!cancelled) setLoading(false) })
+    return () => { cancelled = true }
+  }, [facade, showNotice])
+  const openSavedProject = async (documentId: string) => {
+    const loaded = await facade.app.document.load(documentId)
+    if (!loaded) { showNotice('No saved local snapshot found'); return }
+    showNotice(`Loaded ${loaded.label}`)
+    onOpenWorkspace()
+  }
+  return <div className="projects-page"><PageHeader eyebrow="Project manager" title="Your projects." description="Local-first project storage with explicit save and recovery states." actions={<><button className="button button-outline" onClick={() => onNavigate('import')}><Upload size={16} />Import</button><button className="button button-primary" onClick={onOpenWorkspace}><Plus size={16} />New project</button></>} /><div className="manager-toolbar"><div className="large-search"><Search size={16} /><input placeholder="Search projects" /><kbd>/</kbd></div><div className="toolbar-select"><span>Sort by</span><select><option>Last modified</option><option>Name</option><option>Object count</option></select><ChevronDown size={14} /></div><IconButton icon={LayoutGrid} label="Grid view" active /><IconButton icon={ListTree} label="List view" /></div><div className="project-list">{loading ? <div className="project-list-empty">Loading local projects</div> : savedProjects.length === 0 ? <div className="project-list-empty">No saved local projects</div> : savedProjects.map((project, index) => { const state = project.readOnly ? 'Read only' : project.dirty ? 'Unsaved' : 'Saved'; return <button className="project-list-row" key={project.documentId} onClick={() => void openSavedProject(project.documentId)}><div className={`list-thumbnail preview-${index % 4}`}><div className="preview-shape" /><div className="preview-grid" /></div><div className="list-main"><strong>{project.label}</strong><span>Local / {project.documentId}</span></div><span className="list-count">{project.objectCount} objects</span><span className="list-modified">{new Date(project.updatedAt).toLocaleDateString()}</span><Badge tone={state === 'Unsaved' ? 'amber' : state === 'Read only' ? 'muted' : 'green'}>{state}</Badge><span className="row-action" title="Open project"><ArrowRight size={16} /></span></button> })}</div><div className="storage-banner"><div className="storage-icon"><HardDrive size={18} /></div><div><strong>Local storage</strong><span>{savedProjects.length} saved project{savedProjects.length === 1 ? '' : 's'} · browser-managed capacity</span></div><button className="text-button" onClick={() => onNavigate('settings')}>Manage storage <ArrowRight size={14} /></button></div></div>
 }
 
-function FileFlowPage({ mode, onNavigate, showNotice }: { mode: 'import' | 'export'; onNavigate: (page: Page) => void; showNotice: (message: string) => void }) {
+function FileFlowPage({ mode, onNavigate, showNotice, facade }: { mode: 'import' | 'export'; onNavigate: (page: Page) => void; showNotice: (message: string) => void; facade: BitBybitWebCadFacade }) {
   const isImport = mode === 'import'
-  return <div className="flow-page"><PageHeader eyebrow={isImport ? 'Import model' : 'Export project'} title={isImport ? 'Bring a model into your workspace.' : 'Export a clean deliverable.'} description={isImport ? 'Review format, units and compatibility before the document is created.' : 'Choose an exchange format and keep the native project available for future edits.'} onBack={() => onNavigate('start')} /><div className="flow-layout"><div className="flow-steps"><FlowStep index="01" title="Choose file" active={!isImport} complete={isImport} /><FlowStep index="02" title="Review mapping" active={isImport} complete={false} /><FlowStep index="03" title="Confirm" active={false} complete={false} /></div><section className="flow-card panel-surface"><div className="flow-card-header"><div><span className="section-kicker">Step 01 / 03</span><h2>{isImport ? 'Select a CAD file' : 'Select an export format'}</h2></div><Badge tone="cyan">Local only</Badge></div>{isImport ? <><div className="drop-zone"><div className="drop-icon"><Upload size={20} /></div><strong>Drop a model here</strong><span>or browse from your device</span><button className="button button-outline" onClick={() => showNotice('File picker opened')}><FolderOpen size={15} />Browse files</button><small>STEP · IGES · STL · OBJ · PLY · FCStd</small></div><div className="flow-note"><AlertTriangle size={15} /><span>Imported objects will appear as editable or read-only proxies depending on format support.</span></div></> : <div className="format-grid">{['STEP', 'IGES', 'STL', 'GLB / GLTF', 'Web CAD package'].map((format, index) => <button key={format} className={`format-card ${index === 0 ? 'is-selected' : ''}`} onClick={() => showNotice(`${format} selected`)}><span className="format-icon">{index === 4 ? <FileBox size={18} /> : <FileText size={18} />}</span><strong>{format}</strong><small>{index === 0 ? 'Best for editable solids' : index === 2 ? 'Mesh export' : 'Exchange format'}</small>{index === 0 && <Check size={15} className="format-check" />}</button>)}</div>}<div className="flow-footer"><button className="button button-quiet" onClick={() => onNavigate('start')}>Cancel</button><button className="button button-primary" onClick={() => showNotice(isImport ? 'Next: review mapping' : 'Export queued')}><span>{isImport ? 'Continue' : 'Export'}</span><ArrowRight size={15} /></button></div></section></div></div>
+  const [fcstdReport, setFcstdReport] = useState<FcstdInspection | null>(null)
+  const [selectedFormat, setSelectedFormat] = useState<'STEP' | 'STL' | 'GLB / GLTF' | 'Web CAD package'>('STEP')
+  const [exporting, setExporting] = useState(false)
+  const fileInputRef = useRef<HTMLInputElement>(null)
+  const inspectFile = async (file: File) => {
+    if (!file.name.toLowerCase().endsWith('.fcstd')) { showNotice('Only FCStd inspection is connected to this import boundary'); return }
+    try {
+      const report = facade.project.fcstd.inspect(new Uint8Array(await file.arrayBuffer()))
+      setFcstdReport(report)
+      showNotice(`FCStd inspected: ${report.compatibility.level}`)
+    } catch (error) { setFcstdReport(null); showNotice(`FCStd rejected: ${error instanceof Error ? error.message : String(error)}`) }
+  }
+  const exportModel = async () => {
+    if (selectedFormat !== 'STEP' && selectedFormat !== 'STL') { showNotice(`${selectedFormat} export is not implemented yet`); return }
+    const objectIds = ['fillet', 'chamfer', 'revolution', 'intersection', 'cut', 'union', 'pocket', 'pad', 'box', 'cylinder', 'sphere', 'cone']
+    const shape = objectIds.map((objectId) => facade.geometry.getObjectShape(objectId)).find((candidate): candidate is ShapeHandle => Boolean(candidate))
+    if (!shape) { showNotice('Recompute a valid Part or Part Design shape before exporting'); return }
+    setExporting(true)
+    try {
+      const result = selectedFormat === 'STEP' ? await facade.geometry.exportStep(shape, `${facade.app.document.getActive().label}.step`) : await facade.geometry.exportStl(shape, `${facade.app.document.getActive().label}.stl`)
+      const blob = new Blob([result.text], { type: result.mediaType })
+      const url = URL.createObjectURL(blob)
+      const anchor = document.createElement('a')
+      anchor.href = url
+      anchor.download = result.fileName
+      anchor.click()
+      URL.revokeObjectURL(url)
+      showNotice(`${result.format.toUpperCase()} export downloaded`)
+    } catch (error) {
+      showNotice(`Export failed: ${error instanceof Error ? error.message : String(error)}`)
+    } finally { setExporting(false) }
+  }
+  return <div className="flow-page"><PageHeader eyebrow={isImport ? 'Import model' : 'Export project'} title={isImport ? 'Bring a model into your workspace.' : 'Export a clean deliverable.'} description={isImport ? 'Review format, units and compatibility before the document is created.' : 'Choose an exchange format and keep the native project available for future edits.'} onBack={() => onNavigate('start')} /><div className="flow-layout"><div className="flow-steps"><FlowStep index="01" title="Choose file" active={!isImport} complete={isImport} /><FlowStep index="02" title="Review mapping" active={isImport} complete={false} /><FlowStep index="03" title="Confirm" active={false} complete={false} /></div><section className="flow-card panel-surface"><div className="flow-card-header"><div><span className="section-kicker">Step 01 / 03</span><h2>{isImport ? 'Select a CAD file' : 'Select an export format'}</h2></div><Badge tone="cyan">Local only</Badge></div>{isImport ? <><div className="drop-zone"><div className="drop-icon"><Upload size={20} /></div><strong>Drop a model here</strong><span>or browse from your device</span><input ref={fileInputRef} type="file" accept=".FCStd,.fcstd" hidden onChange={(event) => { const file = event.target.files?.[0]; if (file) void inspectFile(file); event.currentTarget.value = '' }} /><button className="button button-outline" onClick={() => fileInputRef.current?.click()}><FolderOpen size={15} />Browse files</button><small>STEP · IGES · STL · OBJ · PLY · FCStd</small></div><div className="flow-note"><AlertTriangle size={15} /><span>FCStd is currently a read-only metadata inspection boundary. Python/macros are isolated and never executed.</span></div>{fcstdReport && <div className="flow-note"><CheckCircle2 size={15} className="icon-green" /><span>{fcstdReport.label} · {fcstdReport.objects.length} objects · {fcstdReport.compatibility.level}; {fcstdReport.compatibility.warnings.join(' ') || 'No compatibility warnings.'}</span></div>}</> : <div className="format-grid">{['STEP', 'IGES', 'STL', 'GLB / GLTF', 'Web CAD package'].map((format, index) => <button key={format} className={`format-card ${selectedFormat === format ? 'is-selected' : ''}`} disabled={format === 'IGES' || format === 'GLB / GLTF' || format === 'Web CAD package'} onClick={() => { setSelectedFormat(format as typeof selectedFormat); showNotice(`${format} selected`) }}><span className="format-icon">{index === 4 ? <FileBox size={18} /> : <FileText size={18} />}</span><strong>{format}</strong><small>{index === 0 ? 'Best for editable solids' : index === 2 ? 'Mesh export' : 'Not implemented'}</small>{selectedFormat === format && <Check size={15} className="format-check" />}</button>)}</div>}<div className="flow-footer"><button className="button button-quiet" onClick={() => onNavigate('start')}>Cancel</button><button className="button button-primary" disabled={isImport ? false : exporting} onClick={() => { if (isImport) showNotice(fcstdReport ? 'Metadata review complete; import mapping remains disabled' : 'Choose a file to review'); else void exportModel() }}><span>{isImport ? 'Continue' : exporting ? 'Exporting' : `Export ${selectedFormat}`}</span>{exporting ? <RefreshCw size={15} /> : <ArrowRight size={15} />}</button></div></section></div></div>
 }
 
 function FlowStep({ index, title, active, complete }: { index: string; title: string; active: boolean; complete: boolean }) {
@@ -489,8 +581,20 @@ function Shortcut({ keyName, label }: { keyName: string; label: string }) {
   return <div className="shortcut-row"><kbd>{keyName}</kbd><span>{label}</span></div>
 }
 
-function DiagnosticsPage({ onNavigate, showNotice }: { onNavigate: (page: Page) => void; showNotice: (message: string) => void }) {
-  return <div className="diagnostics-page"><PageHeader eyebrow="System status" title="Runtime checks." description="A concise view of browser capabilities, local storage and the current document runtime." onBack={() => onNavigate('start')} actions={<button className="button button-outline" onClick={() => showNotice('Diagnostic package prepared')}><Download size={16} />Export report</button>} /><div className="health-grid"><HealthCard label="WebAssembly" value="Ready" detail="Runtime package loaded on demand" tone="green" icon={Code2} /><HealthCard label="Local storage" value="Capability probe" detail="SQLite WASM + OPFS worker" tone="cyan" icon={HardDrive} /><HealthCard label="Viewport" value="WebGL2" detail="WebGPU can be enabled" tone="cyan" icon={Rotate3D} /><HealthCard label="Document" value="2 warnings" detail="Pump Housing · v18" tone="amber" icon={AlertTriangle} /></div><section className="diagnostic-table panel-surface"><div className="section-title"><div><span className="section-kicker">Runtime</span><h3>Capability checks</h3></div><span className="last-checked">Last checked just now</span></div><DiagnosticRow name="BitBybit Facade" value="Connected" detail="API v0.1 · mock domain adapter" tone="green" /><DiagnosticRow name="Geometry Worker" value="Planned" detail="FreeCAD/OCCT WASM P3 gate" tone="cyan" /><DiagnosticRow name="SQLite WASM" value="Worker configured" detail="Schema v1 · OPFS VFS with memory fallback" tone="cyan" /><DiagnosticRow name="OPFS" value="Capability probe" detail="Requires cross-origin isolation; export fallback is explicit" tone="cyan" /><DiagnosticRow name="FreeCAD baseline" value="1.1.1" detail="Compatibility manifest loaded" tone="cyan" /><DiagnosticRow name="Document warnings" value="2" detail="One downstream reference needs review" tone="amber" onClick={() => showNotice('Document diagnostics opened')} /></section></div>
+function DiagnosticsPage({ onNavigate, showNotice, facade }: { onNavigate: (page: Page) => void; showNotice: (message: string) => void; facade: BitBybitWebCadFacade }) {
+  const [recovery, setRecovery] = useState<{ integrity: string; lastSavedVersion: number | null; warnings: string[] } | null>(null)
+  const [geometry, setGeometry] = useState(() => facade.geometry.capabilities())
+  const document = facade.getState().document
+  const persistence = facade.project.capabilities()
+  const geometryTone = geometry.status === 'ready' ? 'green' : geometry.status === 'failed' || geometry.status === 'unavailable' ? 'amber' : 'cyan'
+  const geometryValue = geometry.status === 'ready' ? 'Ready' : geometry.status === 'initializing' ? 'Loading' : geometry.status
+  useEffect(() => { void facade.project.recovery(facade.getState().document.id).then(setRecovery).catch((error: unknown) => showNotice(`Recovery report unavailable: ${error instanceof Error ? error.message : String(error)}`)) }, [facade, showNotice])
+  useEffect(() => {
+    let disposed = false
+    void facade.geometry.initialize().then((capabilities) => { if (!disposed) setGeometry(capabilities) }).catch((error: unknown) => { if (!disposed) showNotice(`Geometry capability probe failed: ${error instanceof Error ? error.message : String(error)}`) })
+    return () => { disposed = true }
+  }, [facade, showNotice])
+  return <div className="diagnostics-page"><PageHeader eyebrow="System status" title="Runtime checks." description="A concise view of browser capabilities, local storage and the current document runtime." onBack={() => onNavigate('start')} actions={<button className="button button-outline" onClick={() => showNotice('Diagnostic package prepared')}><Download size={16} />Export report</button>} /><div className="health-grid"><HealthCard label="WebAssembly" value={geometryValue} detail={geometry.reason || 'BitBybit OCCT package loads on demand'} tone={geometryTone} icon={Code2} /><HealthCard label="Local storage" value={persistence.mode === 'sqlite-opfs' ? 'SQLite + OPFS' : persistence.mode === 'sqlite-memory' ? 'Memory fallback' : 'Unavailable'} detail={`Schema v${persistence.schemaVersion || 'n/a'} · ${persistence.crossTabWriteLock || 'local queue'}`} tone={persistence.mode === 'unavailable' ? 'amber' : 'cyan'} icon={HardDrive} /><HealthCard label="Viewport" value="WebGL2" detail="Three.js 0.185.1" tone="cyan" icon={Rotate3D} /><HealthCard label="Document" value={`${document.recompute?.errors.length || 0} warnings`} detail={`${document.label} · v${document.version}`} tone={document.recompute?.errors.length ? 'amber' : 'green'} icon={AlertTriangle} /></div><section className="diagnostic-table panel-surface"><div className="section-title"><div><span className="section-kicker">Runtime</span><h3>Capability checks</h3></div><span className="last-checked">Last checked just now</span></div><DiagnosticRow name="BitBybit Facade" value="Connected" detail="API v0.1 · single public entry" tone="green" /><DiagnosticRow name="Geometry Worker" value={geometryValue} detail={`${geometry.provider} ${geometry.version} · Box, Boolean, feature and export boundaries`} tone={geometryTone} /><DiagnosticRow name="SQLite WASM" value={persistence.sqliteWasm ? 'Worker ready' : 'Memory fallback'} detail={`Schema v${persistence.schemaVersion || 'n/a'} · ${persistence.reason || 'SQLite worker configured'}`} tone={persistence.sqliteWasm ? 'green' : 'cyan'} /><DiagnosticRow name="OPFS" value={persistence.opfs ? 'Available' : 'Fallback'} detail="Cross-origin isolation and browser OPFS capability" tone={persistence.opfs ? 'green' : 'cyan'} /><DiagnosticRow name="Recovery" value={recovery?.integrity || 'Checking'} detail={recovery ? `Last saved v${recovery.lastSavedVersion ?? 'none'}${recovery.warnings.length ? ` · ${recovery.warnings.length} warning(s)` : ''}` : 'Checking SQLite integrity and saved snapshot'} tone={recovery?.integrity === 'ok' ? 'green' : 'cyan'} /><DiagnosticRow name="FreeCAD baseline" value="1.1.1" detail="Compatibility manifest loaded; unsupported commands remain disabled" tone="cyan" /><DiagnosticRow name="Document warnings" value={String(document.recompute?.errors.length || 0)} detail="Recompute diagnostics from the current document" tone={document.recompute?.errors.length ? 'amber' : 'green'} onClick={() => showNotice('Document diagnostics opened')} /></section></div>
 }
 
 function HealthCard({ label, value, detail, tone, icon: HealthIcon }: { label: string; value: string; detail: string; tone: 'green' | 'cyan' | 'amber'; icon: Icon }) {

src/facade/dependencyGraph.ts

@@ -11,10 +11,11 @@ export type DependencyEdge = {
 export type RecomputePlan = {
   affected: string[]
   order: string[]
+  levels: string[][]
   cycles: string[][]
 }
 
-export type RecomputeState = 'up-to-date' | 'touched' | 'recomputing' | 'error' | 'upstream-failed'
+export type RecomputeState = 'up-to-date' | 'touched' | 'recomputing' | 'suppressed' | 'upstream-suppressed' | 'error' | 'upstream-failed'
 
 export type RecomputeSnapshot = {
   generation: number
@@ -85,7 +86,14 @@ export class DependencyGraph {
       if (!cyclic.has(nodeId)) order.push(nodeId)
     }
     for (const nodeId of affected) visitDependencies(nodeId)
-    return { affected: [...affected], order, cycles }
+    const levelByNode = new Map<string, number>()
+    for (const nodeId of order) {
+      const level = Math.max(0, ...this.dependenciesOf(nodeId).filter((dependency) => affected.has(dependency)).map((dependency) => (levelByNode.get(dependency) ?? 0) + 1))
+      levelByNode.set(nodeId, level)
+    }
+    const levels: string[][] = []
+    for (const nodeId of order) { const level = levelByNode.get(nodeId) ?? 0; (levels[level] ??= []).push(nodeId) }
+    return { affected: [...affected], order, levels, cycles }
   }
 
   findCycles(scope: Set<string> = this.nodes): string[][] {

src/facade/fcstd.ts

@@ -0,0 +1,261 @@
+import { unzipSync } from 'fflate'
+import { XMLParser } from 'fast-xml-parser'
+import type { DocumentSnapshot, DocumentObjectSnapshot, ModelTreeItem, ObjectPropertySnapshot } from './types'
+
+export type FcstdArchiveLimits = {
+  maxArchiveBytes: number
+  maxEntries: number
+  maxEntryBytes: number
+  maxTotalUncompressedBytes: number
+  maxCompressionRatio: number
+}
+
+export type FcstdEntryRole = 'document' | 'gui-document' | 'shape' | 'thumbnail' | 'script' | 'resource'
+
+export type FcstdEntryMetadata = {
+  path: string
+  compressedBytes: number
+  uncompressedBytes: number
+  compressionMethod: number
+  role: FcstdEntryRole
+}
+
+export type FcstdObjectSupport = 'recognized' | 'proxy' | 'blocked'
+
+export type FcstdObjectSummary = {
+  name: string
+  label: string
+  typeId: string
+  propertyCount: number
+  support: FcstdObjectSupport
+}
+
+export type FcstdCompatibilityReport = {
+  level: 'metadata-compatible' | 'partial' | 'blocked'
+  readOnly: true
+  codeExecutionBlocked: true
+  recognizedObjects: number
+  proxyObjects: number
+  blockedObjects: number
+  unknownTypeIds: string[]
+  warnings: string[]
+}
+
+export type FcstdInspection = {
+  format: 'FCStd'
+  schemaVersion: string
+  label: string
+  entries: FcstdEntryMetadata[]
+  objects: FcstdObjectSummary[]
+  compatibility: FcstdCompatibilityReport
+  proxyDocument: DocumentSnapshot
+}
+
+export const DEFAULT_FCSTD_LIMITS: FcstdArchiveLimits = {
+  maxArchiveBytes: 256 * 1024 * 1024,
+  maxEntries: 20_000,
+  maxEntryBytes: 128 * 1024 * 1024,
+  maxTotalUncompressedBytes: 512 * 1024 * 1024,
+  maxCompressionRatio: 200,
+}
+
+const recognizedTypeIds = new Set([
+  'App::DocumentObjectGroup',
+  'App::FeaturePython',
+  'Part::Feature',
+  'Part::FeaturePython',
+  'PartDesign::Body',
+  'PartDesign::Feature',
+  'PartDesign::Pad',
+  'PartDesign::Pocket',
+  'PartDesign::Fillet',
+  'PartDesign::Chamfer',
+  'PartDesign::Revolution',
+  'Sketcher::SketchObject',
+])
+
+const hashString = (value: string) => {
+  let hash = 2166136261
+  for (let index = 0; index < value.length; index += 1) hash = Math.imul(hash ^ value.charCodeAt(index), 16777619)
+  return (hash >>> 0).toString(16).padStart(8, '0')
+}
+
+const blockedTypeId = (typeId: string) => /(?:FeaturePython|PythonFeature|::Python)/i.test(typeId)
+
+const entryRole = (path: string): FcstdEntryRole => {
+  const lower = path.toLowerCase()
+  if (lower === 'document.xml') return 'document'
+  if (lower === 'guidocument.xml') return 'gui-document'
+  if (lower === 'thumbnails/thumbnail.png') return 'thumbnail'
+  if (lower.endsWith('.brp') || lower.endsWith('.brep')) return 'shape'
+  if (lower.endsWith('.py') || lower.endsWith('.fcmacro') || lower.includes('/macro')) return 'script'
+  return 'resource'
+}
+
+const validateEntryPath = (path: string) => {
+  if (!path || path.includes('\0') || path.includes('\\') || path.startsWith('/') || /^[A-Za-z]:/.test(path)) throw new Error(`Unsafe FCStd entry path: ${path || '<empty>'}`)
+  const segments = path.split('/')
+  if (segments.some((segment) => segment === '..' || segment === '.' || ['__proto__', 'prototype', 'constructor'].includes(segment))) throw new Error(`Unsafe FCStd entry path: ${path}`)
+}
+
+const findEndOfCentralDirectory = (bytes: Uint8Array) => {
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength)
+  const minimum = Math.max(0, bytes.byteLength - 65_557)
+  for (let offset = bytes.byteLength - 22; offset >= minimum; offset -= 1) {
+    if (view.getUint32(offset, true) === 0x06054b50) return offset
+  }
+  throw new Error('FCStd is not a valid ZIP archive: end-of-central-directory record was not found.')
+}
+
+const inspectZipDirectory = (bytes: Uint8Array, limits: FcstdArchiveLimits): FcstdEntryMetadata[] => {
+  if (bytes.byteLength > limits.maxArchiveBytes) throw new RangeError(`FCStd archive exceeds ${limits.maxArchiveBytes} bytes.`)
+  if (bytes.byteLength < 22) throw new Error('FCStd is not a valid ZIP archive.')
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength)
+  const eocd = findEndOfCentralDirectory(bytes)
+  const diskNumber = view.getUint16(eocd + 4, true)
+  const centralDirectoryDisk = view.getUint16(eocd + 6, true)
+  const entriesOnDisk = view.getUint16(eocd + 8, true)
+  const entryCount = view.getUint16(eocd + 10, true)
+  const directorySize = view.getUint32(eocd + 12, true)
+  const directoryOffset = view.getUint32(eocd + 16, true)
+  const commentLength = view.getUint16(eocd + 20, true)
+  if (diskNumber !== 0 || centralDirectoryDisk !== 0 || entriesOnDisk !== entryCount) throw new Error('Multi-disk FCStd archives are not supported.')
+  if (entryCount === 0xffff || directorySize === 0xffffffff || directoryOffset === 0xffffffff) throw new Error('ZIP64 FCStd archives are outside the supported import boundary.')
+  if (entryCount > limits.maxEntries) throw new RangeError(`FCStd archive exceeds ${limits.maxEntries} entries.`)
+  if (eocd + 22 + commentLength > bytes.byteLength || directoryOffset + directorySize > eocd) throw new Error('FCStd central directory is truncated or inconsistent.')
+
+  const decoder = new TextDecoder('utf-8', { fatal: true })
+  const entries: FcstdEntryMetadata[] = []
+  const paths = new Set<string>()
+  let cursor = directoryOffset
+  let totalUncompressed = 0
+  for (let index = 0; index < entryCount; index += 1) {
+    if (cursor + 46 > eocd || view.getUint32(cursor, true) !== 0x02014b50) throw new Error('FCStd central directory contains an invalid file header.')
+    const flags = view.getUint16(cursor + 8, true)
+    const compressionMethod = view.getUint16(cursor + 10, true)
+    const compressedBytes = view.getUint32(cursor + 20, true)
+    const uncompressedBytes = view.getUint32(cursor + 24, true)
+    const nameLength = view.getUint16(cursor + 28, true)
+    const extraLength = view.getUint16(cursor + 30, true)
+    const entryCommentLength = view.getUint16(cursor + 32, true)
+    const diskStart = view.getUint16(cursor + 34, true)
+    const next = cursor + 46 + nameLength + extraLength + entryCommentLength
+    if (next > eocd) throw new Error('FCStd central-directory entry is truncated.')
+    if ((flags & 0x1) !== 0) throw new Error('Encrypted FCStd entries are not supported.')
+    if (diskStart !== 0) throw new Error('Multi-disk FCStd entries are not supported.')
+    if (compressionMethod !== 0 && compressionMethod !== 8) throw new Error(`Unsupported FCStd ZIP compression method: ${compressionMethod}.`)
+    if (compressedBytes === 0xffffffff || uncompressedBytes === 0xffffffff) throw new Error('ZIP64 FCStd entries are outside the supported import boundary.')
+    const path = decoder.decode(bytes.subarray(cursor + 46, cursor + 46 + nameLength))
+    validateEntryPath(path)
+    if (paths.has(path)) throw new Error(`Duplicate FCStd entry path: ${path}`)
+    paths.add(path)
+    if (uncompressedBytes > limits.maxEntryBytes) throw new RangeError(`FCStd entry ${path} exceeds ${limits.maxEntryBytes} bytes.`)
+    const ratio = uncompressedBytes === 0 ? 0 : compressedBytes === 0 ? Number.POSITIVE_INFINITY : uncompressedBytes / compressedBytes
+    if (ratio > limits.maxCompressionRatio) throw new RangeError(`FCStd entry ${path} exceeds the maximum compression ratio.`)
+    totalUncompressed += uncompressedBytes
+    if (totalUncompressed > limits.maxTotalUncompressedBytes) throw new RangeError(`FCStd archive exceeds ${limits.maxTotalUncompressedBytes} uncompressed bytes.`)
+    entries.push({ path, compressedBytes, uncompressedBytes, compressionMethod, role: entryRole(path) })
+    cursor = next
+  }
+  if (cursor !== directoryOffset + directorySize) throw new Error('FCStd central-directory size does not match its entries.')
+  return entries
+}
+
+const asArray = <T>(value: T | T[] | undefined): T[] => value === undefined ? [] : Array.isArray(value) ? value : [value]
+
+const attribute = (node: unknown, name: string): string => {
+  if (!node || typeof node !== 'object') return ''
+  const record = node as Record<string, unknown>
+  const value = record[`@_${name}`] ?? record[name]
+  return value === undefined || value === null ? '' : String(value)
+}
+
+const propertyValue = (property: Record<string, unknown>): string => {
+  for (const value of Object.values(property)) {
+    if (!value || typeof value !== 'object') continue
+    const candidate = attribute(value, 'value')
+    if (candidate) return candidate
+  }
+  return ''
+}
+
+const parseDocumentXml = (bytes: Uint8Array) => {
+  const xml = new TextDecoder('utf-8', { fatal: true }).decode(bytes)
+  if (/<!DOCTYPE|<!ENTITY/i.test(xml)) throw new Error('FCStd Document.xml declarations and entities are not allowed.')
+  const parsed = new XMLParser({
+    ignoreAttributes: false,
+    attributeNamePrefix: '@_',
+    parseTagValue: false,
+    processEntities: false,
+    allowBooleanAttributes: false,
+  }).parse(xml) as Record<string, unknown>
+  const root = (parsed.Document ?? parsed) as Record<string, unknown>
+  const objectDeclarations = asArray((((root.Objects as Record<string, unknown> | undefined)?.Object) as Record<string, unknown> | Record<string, unknown>[] | undefined))
+  const objectData = asArray((((root.ObjectData as Record<string, unknown> | undefined)?.Object) as Record<string, unknown> | Record<string, unknown>[] | undefined))
+  const dataByName = new Map(objectData.map((data) => [attribute(data, 'name'), data]))
+  const documentProperties = asArray((((root.Properties as Record<string, unknown> | undefined)?.Property) as Record<string, unknown> | Record<string, unknown>[] | undefined))
+  const labelProperty = documentProperties.find((property) => attribute(property, 'name') === 'Label')
+  const objects = objectDeclarations.map((declaration): FcstdObjectSummary => {
+    const name = attribute(declaration, 'name') || '<unnamed>'
+    const typeId = attribute(declaration, 'type') || 'App::DocumentObject'
+    const data = dataByName.get(name)
+    const properties = asArray((((data?.Properties as Record<string, unknown> | undefined)?.Property) as Record<string, unknown> | Record<string, unknown>[] | undefined))
+    const objectLabelProperty = properties.find((property) => attribute(property, 'name') === 'Label')
+    const support: FcstdObjectSupport = blockedTypeId(typeId) ? 'blocked' : recognizedTypeIds.has(typeId) ? 'recognized' : 'proxy'
+    return { name, label: objectLabelProperty ? propertyValue(objectLabelProperty) || name : name, typeId, propertyCount: properties.length, support }
+  })
+  return {
+    schemaVersion: attribute(root, 'SchemaVersion') || attribute(root, 'schemaVersion') || 'unknown',
+    label: labelProperty ? propertyValue(labelProperty) || 'Unnamed FreeCAD document' : 'Unnamed FreeCAD document',
+    objects,
+  }
+}
+
+const createProxyProperty = (name: string, label: string, value: string): ObjectPropertySnapshot => ({ name, label, group: 'FCStd import', scope: 'data', type: 'App::PropertyString', value, readOnly: true })
+
+const createProxyDocument = (inspection: Omit<FcstdInspection, 'proxyDocument'>): DocumentSnapshot => {
+  const documentId = `fcstd-${hashString(`${inspection.label}|${inspection.schemaVersion}|${inspection.objects.map((object) => object.name).join('|')}`)}`
+  const tree: ModelTreeItem[] = inspection.objects.map((object) => ({ id: object.name, label: object.label, type: object.typeId.includes('Body') ? 'body' : object.typeId.includes('Sketch') ? 'sketch' : 'feature', state: 'readonly', detail: `${object.typeId} · ${object.support}` }))
+  const objects: DocumentObjectSnapshot[] = inspection.objects.map((object) => ({ id: object.name, typeId: object.typeId, properties: [createProxyProperty('Label', 'Label', object.label), createProxyProperty('TypeId', 'Type', object.typeId), createProxyProperty('ImportSupport', 'Import support', object.support), createProxyProperty('PropertyCount', 'Property count', String(object.propertyCount))] }))
+  return { id: documentId, label: inspection.label, version: 1, dirty: false, readOnly: true, units: 'mm', tree, objects, dependencies: [], recompute: { generation: 0, status: 'idle', objectStates: Object.fromEntries(objects.map((object) => [object.id, 'up-to-date'])), dirtyObjects: [], order: [], errors: [] } }
+}
+
+export const inspectFcstdArchive = (bytes: Uint8Array, limitOverrides: Partial<FcstdArchiveLimits> = {}): FcstdInspection => {
+  const limits = { ...DEFAULT_FCSTD_LIMITS, ...limitOverrides }
+  for (const [name, value] of Object.entries(limits)) if (!Number.isSafeInteger(value) || value <= 0) throw new RangeError(`FCStd limit ${name} must be a positive safe integer.`)
+  const entries = inspectZipDirectory(bytes, limits)
+  const documentEntry = entries.find((entry) => entry.path.toLowerCase() === 'document.xml')
+  if (!documentEntry) throw new Error('FCStd archive does not contain Document.xml.')
+  const files = unzipSync(bytes)
+  for (const entry of entries) {
+    const content = files[entry.path]
+    if (!content || content.byteLength !== entry.uncompressedBytes) throw new Error(`FCStd entry ${entry.path} did not decompress to its declared size.`)
+  }
+  const document = parseDocumentXml(files[documentEntry.path])
+  const warnings: string[] = []
+  const scriptEntries = entries.filter((entry) => entry.role === 'script')
+  if (scriptEntries.length > 0) warnings.push(`${scriptEntries.length} script or macro resource(s) were isolated and will not execute.`)
+  const blockedObjects = document.objects.filter((object) => object.support === 'blocked')
+  if (blockedObjects.length > 0) warnings.push(`${blockedObjects.length} Python-backed object(s) require a non-executing proxy.`)
+  const proxyObjects = document.objects.filter((object) => object.support === 'proxy')
+  if (proxyObjects.length > 0) warnings.push(`${proxyObjects.length} unrecognized object type(s) require a read-only proxy.`)
+  const level: FcstdCompatibilityReport['level'] = blockedObjects.length > 0 ? 'blocked' : proxyObjects.length > 0 || scriptEntries.length > 0 ? 'partial' : 'metadata-compatible'
+  const inspection: Omit<FcstdInspection, 'proxyDocument'> = {
+    format: 'FCStd',
+    schemaVersion: document.schemaVersion,
+    label: document.label,
+    entries,
+    objects: document.objects,
+    compatibility: {
+      level,
+      readOnly: true,
+      codeExecutionBlocked: true,
+      recognizedObjects: document.objects.filter((object) => object.support === 'recognized').length,
+      proxyObjects: proxyObjects.length,
+      blockedObjects: blockedObjects.length,
+      unknownTypeIds: [...new Set(proxyObjects.map((object) => object.typeId))].sort(),
+      warnings,
+    },
+  }
+  return { ...inspection, proxyDocument: createProxyDocument(inspection) }
+}

src/facade/geometryRuntime.ts

@@ -1,7 +1,7 @@
 import { BitByBitOCCT, OccStateEnum } from '@bitbybit-dev/occt-worker'
 import type { Inputs } from '@bitbybit-dev/occt'
-import type { ApplyPlacementInput, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, ChamferInput, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, FilletInput, GeometryCapabilities, GeometryDocumentContext, GeometryFileExport, LinearFeatureParameters, MeshAsset, PadInput, PlanarProfile, PocketInput, Point3, RevolutionInput, ShapeHandle, SubshapeRef } from './types'
-import { createSubshapeRefs } from './topologyNaming'
+import type { ApplyPlacementInput, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, ChamferInput, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, FilletInput, GeometryCapabilities, GeometryDocumentContext, GeometryFileExport, LinearFeatureParameters, MeshAsset, PadInput, PlanarProfile, PocketInput, Point3, RevolutionInput, ShapeHandle, SubshapeRef, SubshapeTopology } from './types'
+import { createEdgeSubshapeRefs, createSubshapeRefs, createVertexSubshapeRefs } from './topologyNaming'
 
 type KernelShapeReference = Inputs.OCCT.TopoDSShapePointer
 type KernelMesh = Inputs.OCCT.DecomposedMeshDto
@@ -408,7 +408,11 @@ export class BitbybitGeometryRuntime {
     validatePocketInput(input)
     const base = this.resolveShape(input.base).reference
     const client = await this.readyClient()
-    const tool = await this.createExtrusion(client, input)
+    const direction = input.direction ?? [0, 1, 0]
+    const featureInput = input.throughAll
+      ? { ...input, length: await this.throughAllLength(client, base, direction), symmetricToPlane: true }
+      : input
+    const tool = await this.createExtrusion(client, featureInput)
     const kernelShape = await client.occt.booleans.difference({ shape: base, shapes: [tool], keepEdges: false })
     return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
@@ -438,6 +442,15 @@ export class BitbybitGeometryRuntime {
     return (await this.mesh(shape, precision)).subshapes ?? []
   }
 
+  async topology(shape: ShapeHandle, precision = 0.05): Promise<SubshapeTopology> {
+    finitePositive(precision, 'precision')
+    const entry = this.resolveShape(shape)
+    const client = await this.readyClient()
+    const mesh = await client.occt.shapeToMesh({ shape: entry.reference, precision, adjustYtoZ: false })
+    const faces = mesh.faceList.map((face) => ({ vertexCoord: face.vertexCoord, normalCoord: face.normalCoord, triIndexes: face.triIndexes }))
+    return { faces: createSubshapeRefs(shape.id, shape.documentVersion, faces, Math.max(1e-5, precision * 0.1)).refs, edges: createEdgeSubshapeRefs(shape.id, shape.documentVersion, faces, Math.max(1e-5, precision * 0.1)).refs, vertices: createVertexSubshapeRefs(shape.id, shape.documentVersion, faces, Math.max(1e-5, precision * 0.1)).refs }
+  }
+
   async release(shape: ShapeHandle): Promise<void> {
     const entry = this.shapes.get(shape.id)
     if (!entry) return
@@ -493,6 +506,25 @@ export class BitbybitGeometryRuntime {
     return client.occt.operations.extrude({ shape: face, direction: extrusion })
   }
 
+  private async throughAllLength(client: BitByBitOCCT, shape: KernelShapeReference, direction: Point3) {
+    const mesh = await client.occt.shapeToMesh({ shape, precision: 0.1, adjustYtoZ: false })
+    const directionLength = magnitude(direction)
+    const normalized = direction.map((coordinate) => coordinate / directionLength) as Point3
+    let minimum = Infinity
+    let maximum = -Infinity
+    for (const face of mesh.faceList) {
+      for (let index = 0; index < face.vertexCoord.length; index += 3) {
+        const point: Point3 = [face.vertexCoord[index], face.vertexCoord[index + 1], face.vertexCoord[index + 2]]
+        const projection = dot(point, normalized)
+        minimum = Math.min(minimum, projection)
+        maximum = Math.max(maximum, projection)
+      }
+    }
+    if (!Number.isFinite(minimum) || !Number.isFinite(maximum)) throw new Error('Through-all pocket cannot determine the base Shape extent.')
+    const span = Math.max(maximum - minimum, 1)
+    return span + Math.max(1, span * 0.05)
+  }
+
   private registerShape(reference: KernelShapeReference, documentId: string, documentVersion: number) {
     const handle: ShapeHandle = {
       id: `shape-${Date.now().toString(36)}-${(++this.sequence).toString(36)}`,

src/facade/index.ts

@@ -3,7 +3,11 @@ export { createSqliteProjectPersistence, PersistenceWriteQueue, ProjectAutosaveS
 export { ThreeViewportAdapter } from './threeViewport'
 export { assertShapeHandleIntegrity, BitbybitGeometryRuntime, normalizeBitbybitMesh, validateBooleanCutInput, validateBooleanIntersectionInput, validateBooleanUnionInput, validateBoxInput, validateConeInput, validateCylinderInput, validatePadInput, validatePlacementInput, validatePlanarProfile, validatePocketInput, validateRevolutionInput, validateSphereInput } from './geometryRuntime'
 export { PROJECT_SCHEMA_MIGRATIONS, PROJECT_SCHEMA_SQL, PROJECT_SCHEMA_VERSION } from './projectSchema'
-export type { ApplyPlacementInput, BitBybitViewportAdapter, BitBybitWebCadFacade, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, ChamferInput, CommandState, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, DocumentObjectSnapshot, DocumentSnapshot, FacadeEvent, FacadeState, FilletInput, GeometryCapabilities, GeometryDocumentContext, GeometryFileExport, LinearFeatureParameters, MeshAsset, ModelTreeItem, ObjectPropertySnapshot, PadInput, PersistenceCapabilities, Placement, PlanarProfile, PocketInput, Point3, ProjectResource, ProjectSaveResult, PropertyValue, RecomputeResult, RevolutionInput, SetExpressionInput, SetPropertyInput, ShapeHandle, SubshapeRef, TaskSnapshot } from './types'
-export { createSubshapeRefs, matchSubshapes, signatureForFace } from './topologyNaming'
+export type { ApplyPlacementInput, BitBybitViewportAdapter, BitBybitWebCadFacade, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, ChamferInput, CommandState, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, DocumentObjectSnapshot, DocumentSnapshot, FacadeEvent, FacadeState, FilletInput, GeometryCapabilities, GeometryDocumentContext, GeometryFileExport, LinearFeatureParameters, MeshAsset, ModelTreeItem, ObjectPropertySnapshot, PadInput, PersistenceCapabilities, Placement, PlanarProfile, PocketInput, Point3, ProjectRecoveryReport, ProjectResource, ProjectSaveResult, ProjectSummary, PropertyValue, RecomputeResult, RevolutionInput, SetExpressionInput, SetPropertyInput, ShapeHandle, SubshapeRef, SubshapeTopology, TaskSnapshot } from './types'
+export { createEdgeSubshapeRefs, createSubshapeRefs, createVertexSubshapeRefs, matchSubshapes, signatureForEdge, signatureForFace, signatureForVertex } from './topologyNaming'
 export { BasicSketchSolverAdapter, cloneSketch, createSketch, solveSketch } from './sketcher'
 export type { SketchConstraint, SketchDiagnostic, SketchGeometry, SketchPoint, SketchPointRef, SketchSnapshot, SketchSolveOptions, SketchSolveResult, SketchSolverAdapter, SketchSolverStatus } from './sketcher'
+export { createFacadeGeometryRecomputeExecutor, executeFacadeRecomputeNode, RecomputeCoordinator } from './recomputeEngine'
+export type { RecomputeExecutionError, RecomputeExecutionOptions, RecomputeExecutionResult, RecomputeExecutionStatus, RecomputeGeometryRuntime, RecomputeNodeContext, RecomputeNodeExecutor, RecomputeNodeResult, RecomputeProgress } from './recomputeEngine'
+export { DEFAULT_FCSTD_LIMITS, inspectFcstdArchive } from './fcstd'
+export type { FcstdArchiveLimits, FcstdCompatibilityReport, FcstdEntryMetadata, FcstdEntryRole, FcstdInspection, FcstdObjectSummary, FcstdObjectSupport } from './fcstd'

src/facade/mockFacade.ts

@@ -16,6 +16,7 @@ import type {
   SetPropertyInput,
   SetExpressionInput,
   RecomputeResult,
+  ShapeHandle,
   TaskSnapshot,
   Unsubscribe,
 } from './types'
@@ -25,6 +26,8 @@ import { ThreeViewportAdapter } from './threeViewport'
 import { DependencyGraph, createRecomputeSnapshot, type DependencyEdge } from './dependencyGraph'
 import { convertQuantity, evaluateQuantityExpression, getUnit, quantityDimensionForUnit, quantityFromNumber, quantityFromUnit, type Quantity } from './units'
 import { cloneSketch, createSketch, solveSketch, type SketchConstraint, type SketchGeometry, type SketchSnapshot } from './sketcher'
+import { createFacadeGeometryRecomputeExecutor, RecomputeCoordinator, type RecomputeExecutionOptions } from './recomputeEngine'
+import { inspectFcstdArchive } from './fcstd'
 
 const initialTree: ModelTreeItem[] = [
   { id: 'origin', label: 'Origin', type: 'folder', children: ['XY_Plane', 'XZ_Plane', 'YZ_Plane'] },
@@ -36,12 +39,13 @@ const initialTree: ModelTreeItem[] = [
   { id: 'reference', label: 'Reference geometry', type: 'folder', children: ['DatumPlane', 'DatumAxis'] },
 ]
 
-const typeIdForItem = (item: ModelTreeItem) => item.type === 'body' ? 'PartDesign::Body' : item.type === 'sketch' ? 'Sketcher::SketchObject' : item.id.startsWith('pad') ? 'PartDesign::Pad' : item.id.startsWith('pocket') ? 'PartDesign::Pocket' : item.id.startsWith('fillet') ? 'PartDesign::Fillet' : item.type === 'feature' ? 'PartDesign::Feature' : 'App::DocumentObjectGroup'
+const typeIdForItem = (item: ModelTreeItem) => item.type === 'body' ? 'PartDesign::Body' : item.type === 'sketch' ? 'Sketcher::SketchObject' : item.id.startsWith('box') ? 'Part::Box' : item.id.startsWith('cylinder') ? 'Part::Cylinder' : item.id.startsWith('sphere') ? 'Part::Sphere' : item.id.startsWith('cone') ? 'Part::Cone' : item.id.startsWith('union') ? 'Part::Fuse' : item.id.startsWith('cut') ? 'Part::Cut' : item.id.startsWith('intersection') ? 'Part::Common' : item.id.startsWith('pad') ? 'PartDesign::Pad' : item.id.startsWith('pocket') ? 'PartDesign::Pocket' : item.id.startsWith('revolution') ? 'PartDesign::Revolution' : item.id.startsWith('fillet') ? 'PartDesign::Fillet' : item.id.startsWith('chamfer') ? 'PartDesign::Chamfer' : item.type === 'feature' ? 'PartDesign::Feature' : 'App::DocumentObjectGroup'
 
 const commonProperties = (item: ModelTreeItem): ObjectPropertySnapshot[] => [
   { name: 'Label', label: 'Label', group: 'Identity', scope: 'data', type: 'App::PropertyString', value: item.label },
   { name: 'TypeId', label: 'Type', group: 'Identity', scope: 'data', type: 'App::PropertyString', value: typeIdForItem(item), readOnly: true },
   { name: 'Status', label: 'Status', group: 'Identity', scope: 'data', type: 'App::PropertyString', value: item.state === 'warning' ? 'Warning' : 'Valid', readOnly: true },
+  ...(item.type === 'feature' ? [{ name: 'Suppressed', label: 'Suppressed', group: 'Feature state', scope: 'data' as const, type: 'App::PropertyBool' as const, value: false, recompute: true }] : []),
 ]
 
 const viewProperties = (): ObjectPropertySnapshot[] => [
@@ -55,6 +59,29 @@ const viewProperties = (): ObjectPropertySnapshot[] => [
 ]
 
 const featureProperties = (item: ModelTreeItem): ObjectPropertySnapshot[] => {
+  if (item.id.startsWith('box')) return [
+    { name: 'Length', label: 'Length', group: 'Box', scope: 'data', type: 'App::PropertyLength', value: 10, unit: 'mm', recompute: true },
+    { name: 'Width', label: 'Width', group: 'Box', scope: 'data', type: 'App::PropertyLength', value: 10, unit: 'mm', recompute: true },
+    { name: 'Height', label: 'Height', group: 'Box', scope: 'data', type: 'App::PropertyLength', value: 10, unit: 'mm', recompute: true },
+  ]
+  if (item.id.startsWith('cylinder')) return [
+    { name: 'Radius', label: 'Radius', group: 'Cylinder', scope: 'data', type: 'App::PropertyLength', value: 5, unit: 'mm', recompute: true },
+    { name: 'Height', label: 'Height', group: 'Cylinder', scope: 'data', type: 'App::PropertyLength', value: 10, unit: 'mm', recompute: true },
+    { name: 'Angle', label: 'Angle', group: 'Cylinder', scope: 'data', type: 'App::PropertyAngle', value: 360, unit: 'deg', recompute: true },
+  ]
+  if (item.id.startsWith('sphere')) return [
+    { name: 'Radius', label: 'Radius', group: 'Sphere', scope: 'data', type: 'App::PropertyLength', value: 5, unit: 'mm', recompute: true },
+  ]
+  if (item.id.startsWith('cone')) return [
+    { name: 'Radius1', label: 'Bottom radius', group: 'Cone', scope: 'data', type: 'App::PropertyLength', value: 5, unit: 'mm', recompute: true },
+    { name: 'Radius2', label: 'Top radius', group: 'Cone', scope: 'data', type: 'App::PropertyLength', value: 0, unit: 'mm', recompute: true },
+    { name: 'Height', label: 'Height', group: 'Cone', scope: 'data', type: 'App::PropertyLength', value: 10, unit: 'mm', recompute: true },
+    { name: 'Angle', label: 'Angle', group: 'Cone', scope: 'data', type: 'App::PropertyAngle', value: 360, unit: 'deg', recompute: true },
+  ]
+  if (item.id.startsWith('union') || item.id.startsWith('cut') || item.id.startsWith('intersection')) return [
+    { name: 'Base', label: 'Base', group: 'Boolean', scope: 'data', type: 'App::PropertyLink', value: null, recompute: true },
+    { name: 'Tool', label: 'Tool', group: 'Boolean', scope: 'data', type: 'App::PropertyLink', value: null, recompute: true },
+  ]
   if (item.id.startsWith('pad')) return [
     { name: 'Length', label: 'Length', group: 'Parameters', scope: 'data', type: 'App::PropertyLength', value: 42, unit: 'mm', recompute: true, expression: '42 mm' },
     { name: 'Profile', label: 'Profile', group: 'Parameters', scope: 'data', type: 'App::PropertyLink', value: 'sketch', recompute: true },
@@ -68,16 +95,25 @@ const featureProperties = (item: ModelTreeItem): ObjectPropertySnapshot[] => {
     { name: 'Base', label: 'Base', group: 'Parameters', scope: 'data', type: 'App::PropertyLink', value: 'pad', recompute: true },
     { name: 'Reversed', label: 'Reversed', group: 'Parameters', scope: 'data', type: 'App::PropertyBool', value: false, recompute: true },
   ]
+  if (item.id.startsWith('revolution')) return [
+    { name: 'Angle', label: 'Angle', group: 'Parameters', scope: 'data', type: 'App::PropertyAngle', value: 360, unit: 'deg', recompute: true },
+    { name: 'Profile', label: 'Profile', group: 'Parameters', scope: 'data', type: 'App::PropertyLink', value: 'sketch', recompute: true },
+    { name: 'Reversed', label: 'Reversed', group: 'Parameters', scope: 'data', type: 'App::PropertyBool', value: false, recompute: true },
+  ]
   if (item.id.startsWith('fillet')) return [
     { name: 'Radius', label: 'Radius', group: 'Parameters', scope: 'data', type: 'App::PropertyLength', value: 3, unit: 'mm', recompute: true },
     { name: 'Base', label: 'Base', group: 'Dependencies', scope: 'data', type: 'App::PropertyLink', value: 'pocket', recompute: true },
   ]
+  if (item.id.startsWith('chamfer')) return [
+    { name: 'Distance', label: 'Distance', group: 'Parameters', scope: 'data', type: 'App::PropertyLength', value: 2, unit: 'mm', recompute: true },
+    { name: 'Base', label: 'Base', group: 'Dependencies', scope: 'data', type: 'App::PropertyLink', value: 'pocket', recompute: true },
+  ]
   if (item.type === 'sketch') return [
     { name: 'Support', label: 'Support', group: 'Attachment', scope: 'data', type: 'App::PropertyLink', value: 'XY_Plane', recompute: true },
     { name: 'ConstraintStatus', label: 'Solver state', group: 'Constraints', scope: 'data', type: 'App::PropertyString', value: 'Fully constrained', readOnly: true },
   ]
   if (item.type === 'body') return [
-    { name: 'Tip', label: 'Tip', group: 'Part Design', scope: 'data', type: 'App::PropertyLink', value: 'fillet', recompute: true },
+    { name: 'Tip', label: 'Tip', group: 'Part Design', scope: 'data', type: 'App::PropertyLink', value: 'fillet', readOnly: true, recompute: true },
   ]
   return []
 }
@@ -128,22 +164,55 @@ const createDocument = (label = 'Pump Housing'): DocumentSnapshot => {
   return document
 }
 
-const selectionRequired = new Set(['pad', 'pocket', 'revolution', 'fillet', 'chamfer', 'hole', 'linear-pattern', 'polar-pattern', 'measure-distance', 'measure-angle', 'measure-area', 'solve-sketch'])
+const selectionRequired = new Set(['pad', 'pocket', 'revolution', 'fillet', 'chamfer', 'union', 'cut', 'intersection', 'check-shape', 'hole', 'linear-pattern', 'polar-pattern', 'measure-distance', 'measure-angle', 'measure-area', 'solve-sketch'])
 const systemCommands = new Set(['new-document', 'save', 'select-object'])
+const implementedCommandIds = new Set(['new-document', 'save', 'select-object', 'create-body', 'create-sketch', 'new-sketch', 'pad', 'pocket', 'revolution', 'fillet', 'chamfer', 'primitive', 'union', 'cut', 'intersection', 'check-shape', 'solve-sketch'])
+const partDesignCommands = new Set(['create-body', 'create-sketch', 'pad', 'pocket', 'revolution', 'fillet', 'chamfer'])
+const partCommands = new Set(['primitive', 'union', 'cut', 'intersection', 'check-shape'])
+const shapeSelectionCommands = new Set(['union', 'cut', 'intersection', 'check-shape', 'fillet', 'chamfer'])
+const featureSelectionCommands = new Set(['pad', 'pocket', 'revolution'])
+const shapeTypeIds = new Set([
+  'Part::Box',
+  'Part::Cylinder',
+  'Part::Sphere',
+  'Part::Cone',
+  'Part::Fuse',
+  'Part::Cut',
+  'Part::Common',
+  'Part::Feature',
+  'PartDesign::Feature',
+  'PartDesign::Pad',
+  'PartDesign::Pocket',
+  'PartDesign::Revolution',
+  'PartDesign::Fillet',
+  'PartDesign::Chamfer',
+])
 const featureCommands: Record<string, { label: string; detail: string }> = {
   'create-body': { label: 'Body', detail: 'Part Design body' },
   'create-sketch': { label: 'Sketch', detail: 'Fully constrained' },
   pad: { label: 'Pad', detail: 'Length 42 mm' },
   pocket: { label: 'Pocket', detail: 'Through all' },
+  revolution: { label: 'Revolution', detail: 'Angle 360 deg' },
   fillet: { label: 'Fillet', detail: 'Radius 3 mm' },
   chamfer: { label: 'Chamfer', detail: 'Length 2 mm' },
+  primitive: { label: 'Box', detail: '10 × 10 × 10 mm' },
+  union: { label: 'Union', detail: 'Boolean fuse' },
+  cut: { label: 'Cut', detail: 'Boolean difference' },
+  intersection: { label: 'Intersection', detail: 'Boolean common' },
 }
 
-const commandState = (commandId: string, activeWorkbench: WorkbenchId, selectedObjectId: string): CommandState => {
+const commandState = (commandId: string, activeWorkbench: WorkbenchId, selectedObjectId: string, selectedTypeId?: string): CommandState => {
   const known = systemCommands.has(commandId) || Object.values(workbenchDefinitions).some((definition) => definition.groups.some((group) => group.commands.some((command) => command.id === commandId)))
   if (!known) return { id: commandId, status: 'disabled', reason: 'Command is not registered in the active manifest.' }
-  if (commandId === 'pad' && activeWorkbench !== 'Part Design') return { id: commandId, status: 'disabled', reason: 'Switch to Part Design to use Pad.' }
+  if (!implementedCommandIds.has(commandId)) return { id: commandId, status: 'disabled', reason: 'Command is visible in the FreeCAD-compatible manifest but its BitBybit business executor is not implemented yet.' }
+  if (partDesignCommands.has(commandId) && activeWorkbench !== 'Part Design') return { id: commandId, status: 'disabled', reason: `Switch to Part Design to use ${commandId}.` }
+  if (partCommands.has(commandId) && activeWorkbench !== 'Part') return { id: commandId, status: 'disabled', reason: `Switch to Part to use ${commandId}.` }
+  if ((commandId === 'new-sketch' || commandId === 'solve-sketch') && activeWorkbench !== 'Sketcher') return { id: commandId, status: 'disabled', reason: `Switch to Sketcher to use ${commandId}.` }
   if (selectionRequired.has(commandId) && !selectedObjectId) return { id: commandId, status: 'disabled', reason: 'Select a compatible object or sub-shape first.' }
+  if (selectedObjectId && !selectedTypeId) return { id: commandId, status: 'disabled', reason: 'The selected object no longer exists in this document.' }
+  if (commandId === 'solve-sketch' && selectedTypeId !== 'Sketcher::SketchObject') return { id: commandId, status: 'disabled', reason: 'Select a Sketcher sketch before solving constraints.' }
+  if (shapeSelectionCommands.has(commandId) && selectedTypeId && !shapeTypeIds.has(selectedTypeId)) return { id: commandId, status: 'disabled', reason: 'Select a solid or shape-producing feature for this operation.' }
+  if (featureSelectionCommands.has(commandId) && selectedTypeId && !shapeTypeIds.has(selectedTypeId) && selectedTypeId !== 'Sketcher::SketchObject') return { id: commandId, status: 'disabled', reason: 'Select a sketch or solid feature as the Part Design source.' }
   return { id: commandId, status: 'enabled' }
 }
 
@@ -151,8 +220,9 @@ const validatePropertyValue = (document: DocumentSnapshot, property: ObjectPrope
   if (property.readOnly) throw new Error(`${property.label} is read-only.`)
   if (property.type === 'App::PropertyBool' && typeof value !== 'boolean') throw new TypeError(`${property.label} requires a boolean value.`)
   if ((property.type === 'App::PropertyString' || property.type === 'App::PropertyEnumeration' || property.type === 'App::PropertyColor') && typeof value !== 'string') throw new TypeError(`${property.label} requires a string value.`)
-  if ((property.type === 'App::PropertyLength' || property.type === 'App::PropertyPercent' || property.type === 'App::PropertyFloat') && (typeof value !== 'number' || !Number.isFinite(value))) throw new TypeError(`${property.label} requires a finite numeric value.`)
-  if (property.type === 'App::PropertyLength' && (value as number) < 0) throw new RangeError(`${property.label} cannot be negative.`)
+  if ((property.type === 'App::PropertyLength' || property.type === 'App::PropertyAngle' || property.type === 'App::PropertyPercent' || property.type === 'App::PropertyFloat') && (typeof value !== 'number' || !Number.isFinite(value))) throw new TypeError(`${property.label} requires a finite numeric value.`)
+  if ((property.type === 'App::PropertyLength' || property.type === 'App::PropertyAngle') && (value as number) < 0) throw new RangeError(`${property.label} cannot be negative.`)
+  if (property.type === 'App::PropertyAngle' && (value as number) > 360) throw new RangeError(`${property.label} must be between 0 and 360 degrees.`)
   if (property.type === 'App::PropertyPercent' && ((value as number) < 0 || (value as number) > 100)) throw new RangeError(`${property.label} must be between 0 and 100.`)
   if (property.type === 'App::PropertyEnumeration' && !property.options?.includes(value as string)) throw new RangeError(`${property.label} is not a registered enumeration value.`)
   if (property.type === 'App::PropertyColor' && !/^#[0-9a-f]{6}$/i.test(value as string)) throw new RangeError(`${property.label} requires a #RRGGBB color.`)
@@ -210,8 +280,23 @@ const markDocumentTouched = (document: DocumentSnapshot, objectIds: Iterable<str
 export function createMockFacade(): BitBybitWebCadFacade {
   const projectPersistence = createSqliteProjectPersistence()
   const geometryRuntime = new BitbybitGeometryRuntime()
+  const featureShapes = new Map<string, ShapeHandle>()
   const autosave = new ProjectAutosaveScheduler((document) => projectPersistence.save(document))
   let state: FacadeState = { apiVersion: '0.1', activeWorkbench: 'Part Design', selectedObjectId: 'pad', document: createDocument(), persistence: projectPersistence.capabilities(), task: null, lastNotice: '', diagnostics: [] }
+  const recomputeCoordinator = new RecomputeCoordinator(
+    createFacadeGeometryRecomputeExecutor(geometryRuntime, featureShapes),
+    (documentId) => state.document.id === documentId ? state.document.version : null,
+  )
+  const releaseFeatureShape = (objectId: string) => {
+    const shape = featureShapes.get(objectId)
+    featureShapes.delete(objectId)
+    if (shape) void geometryRuntime.release(shape)
+  }
+  const clearFeatureShapes = () => {
+    const retained = [...featureShapes.values()]
+    featureShapes.clear()
+    void Promise.all(retained.map((shape) => geometryRuntime.release(shape)))
+  }
   const listeners = new Set<FacadeListener>()
   const undoStack: FacadeState[] = []
   const redoStack: FacadeState[] = []
@@ -230,23 +315,48 @@ export function createMockFacade(): BitBybitWebCadFacade {
     const existing = state.document.tree.filter((item) => item.label.toLowerCase().startsWith(base)).length
     return existing === 0 ? base : `${base}${String(existing).padStart(3, '0')}`
   }
-  const appendFeature = (document: DocumentSnapshot, commandId: string): { document: DocumentSnapshot; objectId: string } => {
-    const definition = featureCommands[commandId]
+  const appendFeature = (document: DocumentSnapshot, commandId: string, draft: Record<string, unknown> = {}): { document: DocumentSnapshot; objectId: string } => {
+    const primitiveType = commandId === 'primitive' && ['Box', 'Cylinder', 'Sphere', 'Cone'].includes(String(draft.primitiveType)) ? String(draft.primitiveType) : 'Box'
+    const definition = commandId === 'primitive' ? { label: primitiveType, detail: primitiveType === 'Box' ? '10 × 10 × 10 mm' : `${primitiveType} primitive` } : featureCommands[commandId]
     if (!definition) return { document, objectId: '' }
     const objectId = nextFeatureId(definition.label)
     const type = commandId === 'create-sketch' ? 'sketch' : commandId === 'create-body' ? 'body' : 'feature'
     const item: ModelTreeItem = { id: objectId, label: definition.label, type, state: type === 'body' ? 'active' : 'valid', detail: definition.detail }
     const tree: ModelTreeItem[] = document.tree.map((entry) => ({ ...entry, children: entry.children ? [...entry.children] : undefined }))
-    if (type === 'body') tree.push({ ...item, children: [] })
+    const isPartObject = partCommands.has(commandId)
+    if (type === 'body' || isPartObject) tree.push({ ...item, children: type === 'body' ? [] : undefined })
     else {
       const body = tree.find((entry) => entry.type === 'body')
       if (body) body.children = [...(body.children || []), objectId]
       tree.push(item)
     }
-    const objects = [...document.objects.map((object) => ({ ...object, properties: object.properties.map((property) => ({ ...property })), sketch: object.sketch ? cloneSketch(object.sketch) : undefined })), createObjectSnapshot(item)]
+    const objectSnapshot = createObjectSnapshot(item)
+    const sourceId = typeof draft.source === 'string' && document.objects.some((object) => object.id === draft.source) ? draft.source : ''
+    const sourceObject = sourceId ? document.objects.find((object) => object.id === sourceId) : undefined
+    objectSnapshot.properties = objectSnapshot.properties.map((property) => {
+      if (!property.recompute) return property
+      const candidate = draft[property.name.toLowerCase()]
+      if (property.type === 'App::PropertyLink' && typeof candidate === 'string' && candidate.length > 0) return { ...property, value: candidate }
+      if (property.type === 'App::PropertyLink' && sourceObject && property.name === 'Profile' && sourceObject.typeId === 'Sketcher::SketchObject') return { ...property, value: sourceObject.id }
+      if (property.type === 'App::PropertyLink' && sourceObject && property.name === 'Base' && shapeTypeIds.has(sourceObject.typeId)) return { ...property, value: sourceObject.id }
+      if (property.type === 'App::PropertyBool' && typeof candidate === 'boolean') return { ...property, value: candidate }
+      if ((property.type === 'App::PropertyLength' || property.type === 'App::PropertyAngle' || property.type === 'App::PropertyPercent' || property.type === 'App::PropertyFloat') && typeof candidate === 'number' && Number.isFinite(candidate)) return { ...property, value: candidate }
+      if (property.type === 'App::PropertyEnumeration' && typeof candidate === 'string' && property.options?.includes(candidate)) return { ...property, value: candidate }
+      return property
+    })
+    if (isPartObject && commandId !== 'primitive') {
+      objectSnapshot.properties = objectSnapshot.properties.map((property) => property.name === 'Base' && typeof draft.base !== 'string' && state.selectedObjectId ? { ...property, value: state.selectedObjectId } : property)
+    }
+    const objects = [...document.objects.map((object) => ({ ...object, properties: object.properties.map((property) => ({ ...property })), sketch: object.sketch ? cloneSketch(object.sketch) : undefined })), objectSnapshot]
+    const tipObject = type === 'feature' && partDesignCommands.has(commandId) && commandId !== 'create-sketch' ? objects.find((object) => object.id === 'body') : undefined
+    if (tipObject) {
+      const tip = tipObject.properties.find((property) => property.name === 'Tip')
+      if (tip) tip.value = objectId
+    }
     const nextDocument: DocumentSnapshot = { ...document, version: document.version + 1, dirty: true, tree, objects }
     nextDocument.dependencies = collectDependencyEdges(nextDocument)
     nextDocument.recompute = createRecomputeSnapshot(objects.map((object) => object.id), document.recompute?.generation ?? 0)
+    markDocumentTouched(nextDocument, tipObject ? [objectId, tipObject.id] : [objectId])
     return { document: nextDocument, objectId }
   }
   const setProperty = ({ objectId, propertyName, value }: SetPropertyInput) => {
@@ -279,7 +389,7 @@ export function createMockFacade(): BitBybitWebCadFacade {
     if (propertyIndex < 0) throw new Error(`Property does not exist: ${objectId}.${propertyName}`)
     const sourceProperty = sourceObject.properties[propertyIndex]
     if (sourceProperty.readOnly) throw new Error(`${sourceProperty.label} is read-only.`)
-    if (!['App::PropertyLength', 'App::PropertyFloat', 'App::PropertyPercent'].includes(sourceProperty.type)) throw new TypeError(`${sourceProperty.label} does not accept expressions.`)
+    if (!['App::PropertyLength', 'App::PropertyAngle', 'App::PropertyFloat', 'App::PropertyPercent'].includes(sourceProperty.type)) throw new TypeError(`${sourceProperty.label} does not accept expressions.`)
     const evaluated = expectedExpressionValue(sourceProperty, expression, state.document)
     const references = expressionReferences(expression)
     const variables = expressionVariables(state.document)
@@ -310,20 +420,21 @@ export function createMockFacade(): BitBybitWebCadFacade {
       const message = `Dependency cycle: ${cycle.join(' -> ')}`
       for (const objectId of cycle) { objectStates[objectId] = 'error'; errors.push({ objectId, code: 'DEPENDENCY_CYCLE', message }) }
     }
-    if (errors.length === 0) {
-      for (const objectId of plan.order) {
-        objectStates[objectId] = 'up-to-date'
-        const item = document.tree.find((candidate) => candidate.id === objectId)
-        if (item?.state === 'dirty') item.state = item.type === 'body' ? 'active' : 'valid'
-        const status = document.objects.find((candidate) => candidate.id === objectId)?.properties.find((property) => property.name === 'Status')
-        if (status?.value === 'Touched') status.value = 'Valid'
-      }
-    } else {
-      for (const objectId of plan.affected) if (objectStates[objectId] !== 'error') objectStates[objectId] = 'upstream-failed'
-      for (const objectId of plan.affected) {
-        const item = document.tree.find((candidate) => candidate.id === objectId)
-        if (item && item.state !== 'active') item.state = 'warning'
+    for (const objectId of plan.order) {
+      const dependencies = graph.dependenciesOf(objectId)
+      if (dependencies.some((dependencyId) => objectStates[dependencyId] === 'error' || objectStates[dependencyId] === 'upstream-failed')) {
+        objectStates[objectId] = 'upstream-failed'
+      } else if (dependencies.some((dependencyId) => objectStates[dependencyId] === 'suppressed' || objectStates[dependencyId] === 'upstream-suppressed')) {
+        objectStates[objectId] = 'upstream-suppressed'
+      } else {
+        const object = document.objects.find((candidate) => candidate.id === objectId)
+        objectStates[objectId] = object?.properties.some((property) => property.name === 'Suppressed' && property.value === true) ? 'suppressed' : 'up-to-date'
       }
+      if (objectStates[objectId] === 'suppressed' || objectStates[objectId] === 'upstream-suppressed') releaseFeatureShape(objectId)
+      const item = document.tree.find((candidate) => candidate.id === objectId)
+      if (item && item.state !== 'readonly') item.state = objectStates[objectId] === 'upstream-failed' ? 'warning' : item.type === 'body' ? 'active' : 'valid'
+      const status = document.objects.find((candidate) => candidate.id === objectId)?.properties.find((property) => property.name === 'Status')
+      if (status) status.value = objectStates[objectId] === 'suppressed' ? 'Suppressed' : objectStates[objectId] === 'upstream-suppressed' ? 'Upstream suppressed' : objectStates[objectId] === 'up-to-date' ? 'Valid' : 'Warning'
     }
     const nextRecompute = { generation, status: errors.length === 0 ? 'completed' as const : 'failed' as const, objectStates, dirtyObjects: errors.length === 0 ? [] : plan.affected, order: plan.order, errors }
     document.recompute = nextRecompute
@@ -332,6 +443,47 @@ export function createMockFacade(): BitBybitWebCadFacade {
     emitState()
     return { ...plan, generation, status: nextRecompute.status, errors }
   }
+  const recomputeDocumentAsync = async (options: RecomputeExecutionOptions = {}) => {
+    const source = cloneDocumentSnapshot(state.document)
+    const result = await recomputeCoordinator.run(source, options)
+    if ((result.status !== 'completed' && result.status !== 'failed') || state.document.id !== source.id || state.document.version !== source.version) return result
+
+    const document = cloneDocumentSnapshot(state.document)
+    const updates = new Map(result.objectUpdates.map((object) => [object.id, object]))
+    document.objects = document.objects.map((object) => updates.has(object.id) ? updates.get(object.id) as DocumentObjectSnapshot : object)
+    for (const objectId of result.affected) {
+      if (result.objectStates[objectId] === 'suppressed' || result.objectStates[objectId] === 'upstream-suppressed') releaseFeatureShape(objectId)
+      const item = document.tree.find((candidate) => candidate.id === objectId)
+      if (!item || item.state === 'readonly') continue
+      if (result.objectStates[objectId] === 'up-to-date' || result.objectStates[objectId] === 'suppressed' || result.objectStates[objectId] === 'upstream-suppressed') item.state = item.type === 'body' ? 'active' : 'valid'
+      else if (result.objectStates[objectId] === 'error' || result.objectStates[objectId] === 'upstream-failed') item.state = 'warning'
+      const status = document.objects.find((candidate) => candidate.id === objectId)?.properties.find((property) => property.name === 'Status')
+      if (status) status.value = result.objectStates[objectId] === 'suppressed' ? 'Suppressed' : result.objectStates[objectId] === 'upstream-suppressed' ? 'Upstream suppressed' : result.objectStates[objectId] === 'up-to-date' ? 'Valid' : 'Warning'
+    }
+    document.recompute = {
+      generation: result.generation,
+      status: result.status,
+      objectStates: result.objectStates,
+      dirtyObjects: result.dirtyObjects,
+      order: result.order,
+      errors: result.errors,
+    }
+    state = { ...state, document }
+    if (document.dirty) autosave.schedule(document)
+    emitState()
+    return result
+  }
+  const loadDocument = async (documentId: string) => {
+    recomputeCoordinator.cancel()
+    const loaded = await projectPersistence.load(documentId)
+    if (!loaded) return null
+    clearFeatureShapes()
+    const document = cloneDocumentSnapshot(loaded)
+    commit({ ...state, document, selectedObjectId: '', task: null })
+    await recomputeDocumentAsync({ dirtyObjectIds: document.objects.map((object) => object.id) })
+    notify(`Loaded ${document.label}`)
+    return getState().document
+  }
   const getSketch = (objectId: string) => {
     const object = state.document.objects.find((candidate) => candidate.id === objectId)
     return object?.sketch ? cloneSketch(object.sketch) : null
@@ -381,26 +533,28 @@ export function createMockFacade(): BitBybitWebCadFacade {
   const applyTask = () => {
     const task = state.task
     if (!task || task.status !== 'preview') return
-    const result = appendFeature(state.document, task.commandId)
+    const result = appendFeature(state.document, task.commandId, task.draft)
     if (!result.objectId) {
       state = { ...state, task: { ...task, status: 'completed' } }
       emitState()
       return
     }
     commit({ ...state, document: result.document, selectedObjectId: result.objectId, task: { ...task, status: 'completed' } })
-    notify(`${featureCommands[task.commandId].label} created`)
+    notify(`${result.document.tree.find((item) => item.id === result.objectId)?.label || featureCommands[task.commandId]?.label || task.commandId} created`)
   }
   const execute = ({ commandId, payload }: ExecuteCommandInput) => {
     const requestId = `req-${++requestSequence}`
     const context: FacadeRequestContext = { apiVersion: state.apiVersion, requestId, documentId: state.document.id, documentVersion: state.document.version, workbench: state.activeWorkbench }
-    const status = commandState(commandId, state.activeWorkbench, state.selectedObjectId)
+    const selectedTypeId = state.document.objects.find((object) => object.id === state.selectedObjectId)?.typeId
+    const status = commandState(commandId, state.activeWorkbench, state.selectedObjectId, selectedTypeId)
     if (status.status === 'disabled') {
-      const diagnostic: Diagnostic = { id: `diag-${++requestSequence}`, severity: 'warning', code: 'COMMAND_DISABLED', message: status.reason || 'Command is disabled', objectId: state.selectedObjectId || undefined, requestId }
+      const code = status.reason?.startsWith('Command is visible in the FreeCAD-compatible manifest') ? 'COMMAND_UNIMPLEMENTED' : 'COMMAND_DISABLED'
+      const diagnostic: Diagnostic = { id: `diag-${++requestSequence}`, severity: 'warning', code, message: status.reason || 'Command is disabled', objectId: state.selectedObjectId || undefined, requestId }
       state = { ...state, diagnostics: [...state.diagnostics, diagnostic] }
       emit({ type: 'diagnostic.added', diagnostic, context }); emit({ type: 'command.failed', commandId, context, message: status.reason }); notify(status.reason || 'Command is disabled'); return requestId
     }
     emit({ type: 'command.started', commandId, context })
-    if (commandId === 'new-document') commit({ ...state, document: createDocument('Untitled document'), selectedObjectId: '' })
+    if (commandId === 'new-document') { clearFeatureShapes(); commit({ ...state, document: createDocument('Untitled document'), selectedObjectId: '' }) }
     else if (commandId === 'save') {
       const savedDocument = { ...state.document, dirty: false, version: state.document.version + 1 }
       commit({ ...state, document: savedDocument })
@@ -411,19 +565,40 @@ export function createMockFacade(): BitBybitWebCadFacade {
       })
     }
     else if (commandId === 'select-object' && typeof payload?.objectId === 'string') select(payload.objectId)
+    else if (commandId === 'check-shape') {
+      const objectId = state.selectedObjectId
+      const shape = featureShapes.get(objectId)
+      const reportFailure = (code: string, message: string) => {
+        const diagnostic: Diagnostic = { id: `diag-${++requestSequence}`, severity: 'warning', code, message, objectId, requestId }
+        state = { ...state, diagnostics: [...state.diagnostics, diagnostic] }
+        emit({ type: 'diagnostic.added', diagnostic, context })
+        notify(message)
+      }
+      if (!shape) reportFailure('SHAPE_NOT_RECOMPUTED', `No valid Shape is cached for ${objectId}; recompute the document first.`)
+      else void geometryRuntime.topology(shape, 0.05).then((topology) => {
+        const count = topology.faces.length + topology.edges.length + topology.vertices.length
+        if (count === 0) throw new Error('Shape topology is empty.')
+        const message = `Shape check passed: ${topology.faces.length} faces, ${topology.edges.length} edges, ${topology.vertices.length} vertices`
+        const diagnostic: Diagnostic = { id: `diag-${++requestSequence}`, severity: 'info', code: 'SHAPE_CHECK_PASSED', message, objectId, requestId }
+        state = { ...state, diagnostics: [...state.diagnostics, diagnostic] }
+        emit({ type: 'diagnostic.added', diagnostic, context })
+        notify(message)
+      }).catch((error: unknown) => reportFailure('SHAPE_CHECK_FAILED', error instanceof Error ? error.message : String(error)))
+    }
     else if (commandId === 'solve-sketch') { solveSketchObject(state.selectedObjectId); notify('Sketch solver completed') }
-    else if (featureCommands[commandId]) beginTask(commandId, { source: state.selectedObjectId || null })
+    else if (commandId === 'new-sketch') beginTask('create-sketch', { source: state.selectedObjectId || null })
+    else if (featureCommands[commandId]) beginTask(commandId, partCommands.has(commandId) && commandId !== 'primitive' ? { source: state.selectedObjectId || null, base: state.selectedObjectId || '', tool: '' } : { source: state.selectedObjectId || null })
     emit({ type: 'command.completed', commandId, context }); emitState(); return requestId
   }
 
   const facade: BitBybitWebCadFacade = {
-    app: { document: { getActive: () => getState().document, getObject: (objectId) => { const object = state.document.objects.find((candidate) => candidate.id === objectId); return object ? { ...object, properties: object.properties.map((property) => ({ ...property, options: property.options ? [...property.options] : undefined })), sketch: object.sketch ? cloneSketch(object.sketch) : undefined } : null }, create: (label) => { commit({ ...state, document: createDocument(label), selectedObjectId: '' }); return getState().document }, markDirty: () => { commit({ ...state, document: { ...state.document, dirty: true } }) }, setProperty, setExpression, recompute: recomputeDocument, getDependencies: () => (state.document.dependencies ?? []).map((edge) => ({ ...edge })) }, expression: { evaluate: (expression, variables = {}) => evaluateQuantityExpression(expression, new Map(Object.entries(variables))), dimensionForUnit: quantityDimensionForUnit }, sketcher: { get: getSketch, addGeometry: addSketchGeometry, addConstraint: addSketchConstraint, solve: solveSketchObject } },
-    history: { canUndo: () => undoStack.length > 0, canRedo: () => redoStack.length > 0, undo: () => { const previous = undoStack.pop(); if (!previous) return; redoStack.push(getState()); state = previous; emitState(); notify('Undo applied') }, redo: () => { const next = redoStack.pop(); if (!next) return; undoStack.push(getState()); state = next; emitState(); notify('Redo applied') } },
-    gui: { workbench: { list: () => Object.keys(workbenchDefinitions) as WorkbenchId[], getActive: () => state.activeWorkbench, setActive }, command: { getState: (commandId) => commandState(commandId, state.activeWorkbench, state.selectedObjectId), list: (workbench) => workbenchDefinitions[workbench].groups.flatMap((group) => group.commands), execute } },
+    app: { document: { getActive: () => getState().document, getObject: (objectId) => { const object = state.document.objects.find((candidate) => candidate.id === objectId); return object ? { ...object, properties: object.properties.map((property) => ({ ...property, options: property.options ? [...property.options] : undefined })), sketch: object.sketch ? cloneSketch(object.sketch) : undefined } : null }, create: (label) => { recomputeCoordinator.cancel(); clearFeatureShapes(); commit({ ...state, document: createDocument(label), selectedObjectId: '' }); return getState().document }, load: loadDocument, markDirty: () => { commit({ ...state, document: { ...state.document, dirty: true } }) }, setProperty, setExpression, recompute: recomputeDocument, recomputeAsync: recomputeDocumentAsync, cancelRecompute: () => recomputeCoordinator.cancel(), getDependencies: () => (state.document.dependencies ?? []).map((edge) => ({ ...edge })) }, expression: { evaluate: (expression, variables = {}) => evaluateQuantityExpression(expression, new Map(Object.entries(variables))), dimensionForUnit: quantityDimensionForUnit }, sketcher: { get: getSketch, addGeometry: addSketchGeometry, addConstraint: addSketchConstraint, solve: solveSketchObject } },
+    history: { canUndo: () => undoStack.length > 0, canRedo: () => redoStack.length > 0, undo: () => { const previous = undoStack.pop(); if (!previous) return; clearFeatureShapes(); redoStack.push(getState()); state = previous; emitState(); notify('Undo applied') }, redo: () => { const next = redoStack.pop(); if (!next) return; clearFeatureShapes(); undoStack.push(getState()); state = next; emitState(); notify('Redo applied') } },
+    gui: { workbench: { list: () => Object.keys(workbenchDefinitions) as WorkbenchId[], getActive: () => state.activeWorkbench, setActive }, command: { getState: (commandId) => commandState(commandId, state.activeWorkbench, state.selectedObjectId, state.document.objects.find((object) => object.id === state.selectedObjectId)?.typeId), list: (workbench) => workbenchDefinitions[workbench].groups.flatMap((group) => group.commands), execute } },
     selection: { getObjectId: () => state.selectedObjectId, select, clear: () => select('') },
     task: { getActive: () => getState().task, begin: beginTask, update: (draft) => { if (state.task) state = { ...state, task: { ...state.task, draft: { ...state.task.draft, ...draft } } }; emitState() }, apply: applyTask, cancel: () => { if (state.task) state = { ...state, task: { ...state.task, status: 'cancelled' } }; emitState() } },
-    project: { capabilities: () => projectPersistence.capabilities(), save: (document = getState().document) => projectPersistence.save(document), load: (documentId) => projectPersistence.load(documentId), resource: projectPersistence.resource },
-    geometry: { capabilities: () => geometryRuntime.capabilities(), initialize: () => geometryRuntime.initialize(), createBox: (input) => geometryRuntime.createBox(input), createCylinder: (input) => geometryRuntime.createCylinder(input), createSphere: (input) => geometryRuntime.createSphere(input), createCone: (input) => geometryRuntime.createCone(input), applyPlacement: (input) => geometryRuntime.applyPlacement(input), union: (input) => geometryRuntime.union(input), cut: (input) => geometryRuntime.cut(input), intersection: (input) => geometryRuntime.intersection(input), fillet: (input) => geometryRuntime.fillet(input), chamfer: (input) => geometryRuntime.chamfer(input), exportStep: (shape, fileName) => geometryRuntime.exportStep(shape, fileName), exportStl: (shape, fileName, precision) => geometryRuntime.exportStl(shape, fileName, precision), pad: (input) => geometryRuntime.pad(input), pocket: (input) => geometryRuntime.pocket(input), revolution: (input) => geometryRuntime.revolution(input), mesh: (shape, precision) => geometryRuntime.mesh(shape, precision), subshapes: (shape, precision) => geometryRuntime.subshapes(shape, precision), release: (shape) => geometryRuntime.release(shape), dispose: () => geometryRuntime.dispose() },
+    project: { capabilities: () => projectPersistence.capabilities(), subscribeExternalChanges: (listener) => projectPersistence.subscribeExternalChanges(listener), list: () => projectPersistence.list(), save: (document = getState().document) => projectPersistence.save(document), load: (documentId) => projectPersistence.load(documentId), recovery: (documentId) => projectPersistence.recovery(documentId), fcstd: { inspect: (bytes, limits) => inspectFcstdArchive(bytes, limits) }, resource: projectPersistence.resource },
+    geometry: { capabilities: () => geometryRuntime.capabilities(), initialize: () => geometryRuntime.initialize(), createBox: (input) => geometryRuntime.createBox(input), createCylinder: (input) => geometryRuntime.createCylinder(input), createSphere: (input) => geometryRuntime.createSphere(input), createCone: (input) => geometryRuntime.createCone(input), applyPlacement: (input) => geometryRuntime.applyPlacement(input), union: (input) => geometryRuntime.union(input), cut: (input) => geometryRuntime.cut(input), intersection: (input) => geometryRuntime.intersection(input), fillet: (input) => geometryRuntime.fillet(input), chamfer: (input) => geometryRuntime.chamfer(input), exportStep: (shape, fileName) => geometryRuntime.exportStep(shape, fileName), exportStl: (shape, fileName, precision) => geometryRuntime.exportStl(shape, fileName, precision), pad: (input) => geometryRuntime.pad(input), pocket: (input) => geometryRuntime.pocket(input), revolution: (input) => geometryRuntime.revolution(input), mesh: (shape, precision) => geometryRuntime.mesh(shape, precision), subshapes: (shape, precision) => geometryRuntime.subshapes(shape, precision), topology: (shape, precision) => geometryRuntime.topology(shape, precision), getObjectShape: (objectId) => { const shape = featureShapes.get(objectId); return shape ? { ...shape } : null }, release: (shape) => geometryRuntime.release(shape), dispose: () => { clearFeatureShapes(); geometryRuntime.dispose() } },
     viewport: { createAdapter: () => new ThreeViewportAdapter() },
     getState, subscribe: (listener) => { listeners.add(listener); return () => { listeners.delete(listener) } }, notify,
   }

src/facade/persistenceWorker.ts

@@ -1,11 +1,13 @@
 import sqlite3InitModule, { type Database, type Sqlite3Static } from '@sqlite.org/sqlite-wasm'
 import { PROJECT_SCHEMA_MIGRATIONS, PROJECT_SCHEMA_VERSION } from './projectSchema'
-import type { DocumentObjectSnapshot, DocumentSnapshot, ModelTreeItem, ObjectPropertySnapshot, PersistenceCapabilities, ProjectResource } from './types'
+import type { DocumentObjectSnapshot, DocumentSnapshot, ModelTreeItem, ObjectPropertySnapshot, PersistenceCapabilities, ProjectRecoveryReport, ProjectResource, ProjectSummary } from './types'
 
 type PersistenceRequest =
   | { id: number; type: 'initialize' }
+  | { id: number; type: 'list-projects' }
   | { id: number; type: 'save-document'; document: DocumentSnapshot }
   | { id: number; type: 'load-document'; documentId: string }
+  | { id: number; type: 'recovery-report'; documentId: string }
   | { id: number; type: 'put-resource'; bytes: ArrayBuffer; mediaType: string }
   | { id: number; type: 'get-resource'; hash: string }
   | { id: number; type: 'release-resource'; hash: string }
@@ -13,8 +15,10 @@ type PersistenceRequest =
 
 type PersistenceResponse =
   | { id: number; ok: true; type: 'initialized'; capabilities: PersistenceCapabilities }
+  | { id: number; ok: true; type: 'projects-listed'; projects: ProjectSummary[] }
   | { id: number; ok: true; type: 'saved'; documentId: string; documentVersion: number; persistedAt: number; mode: PersistenceCapabilities['mode'] }
   | { id: number; ok: true; type: 'loaded'; document: DocumentSnapshot | null }
+  | { id: number; ok: true; type: 'recovery-report'; report: ProjectRecoveryReport }
   | { id: number; ok: true; type: 'resource-put'; resource: ProjectResource }
   | { id: number; ok: true; type: 'resource-get'; bytes: ArrayBuffer | null }
   | { id: number; ok: true; type: 'resource-released' }
@@ -30,6 +34,7 @@ const workerScope = globalThis as unknown as WorkerScope
 let sqlite3: Sqlite3Static | undefined
 let database: Database | undefined
 let assetsDirectory: FileSystemDirectoryHandle | undefined
+const transientResources = new Map<string, { resource: ProjectResource; bytes: Uint8Array }>()
 let capabilities: PersistenceCapabilities = { mode: 'unavailable', sqliteWasm: false, opfs: false, schemaVersion: PROJECT_SCHEMA_VERSION, reason: 'SQLite WASM has not been initialized.' }
 
 const cloneTree = (tree: ModelTreeItem[]) => tree.map((item) => ({ ...item, children: item.children ? [...item.children] : undefined }))
@@ -98,6 +103,21 @@ const saveDocument = (document: DocumentSnapshot) => {
   return { documentId: document.id, documentVersion: document.version, persistedAt: now, mode: capabilities.mode }
 }
 
+const listProjects = (): ProjectSummary[] => {
+  if (!database) throw new Error('Persistence database is not initialized.')
+  const rows = database.exec({
+    sql: `SELECT documents.id AS document_id, documents.label, documents.version, documents.dirty, documents.read_only, projects.updated_at, COUNT(objects.id) AS object_count
+      FROM documents
+      JOIN projects ON projects.id = documents.project_id
+      LEFT JOIN objects ON objects.document_id = documents.id
+      GROUP BY documents.id, documents.label, documents.version, documents.dirty, documents.read_only, projects.updated_at
+      ORDER BY projects.updated_at DESC`,
+    rowMode: 'object',
+    returnValue: 'resultRows',
+  }) as Array<Record<string, string | number>>
+  return rows.map((row) => ({ documentId: String(row.document_id), label: String(row.label), documentVersion: Number(row.version), objectCount: Number(row.object_count), dirty: Boolean(row.dirty), readOnly: Boolean(row.read_only), updatedAt: Number(row.updated_at) }))
+}
+
 const loadDocument = (documentId: string): DocumentSnapshot | null => {
   if (!database) throw new Error('Persistence database is not initialized.')
   const documents = database.exec({ sql: 'SELECT id, label, version, dirty, read_only, units, recompute_json FROM documents WHERE id = ?', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | number | null>>
@@ -133,9 +153,26 @@ const loadDocument = (documentId: string): DocumentSnapshot | null => {
   }
 }
 
+const recoveryReport = (documentId: string): ProjectRecoveryReport => {
+  if (!database) throw new Error('Persistence database is not initialized.')
+  const integrityRows = database.exec({ sql: 'PRAGMA integrity_check', rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string>>
+  const integrityValue = String(integrityRows[0]?.integrity_check ?? '')
+  const documents = database.exec({ sql: 'SELECT version, dirty FROM documents WHERE id = ?', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | number>>
+  const warnings: string[] = []
+  if (!documents[0]) warnings.push('No saved document exists for this ID.')
+  if (integrityValue !== 'ok') warnings.push(`SQLite integrity check returned: ${integrityValue || 'no result'}.`)
+  return { documentId, mode: capabilities.mode, schemaVersion: capabilities.schemaVersion, integrity: !documents[0] ? 'unavailable' : integrityValue === 'ok' ? 'ok' : 'failed', lastSavedVersion: documents[0] ? Number(documents[0].version) : null, dirtyAtLastSave: documents[0] ? Boolean(documents[0].dirty) : null, warnings }
+}
+
 const putResource = async (bytes: ArrayBuffer, mediaType: string): Promise<ProjectResource> => {
   if (!database) throw new Error('Persistence database is not initialized.')
   const hash = await hashBytes(bytes)
+  if (!capabilities.opfs) {
+    const existing = transientResources.get(hash)
+    const resource = { hash, byteLength: bytes.byteLength, mediaType, refCount: (existing?.resource.refCount || 0) + 1 }
+    transientResources.set(hash, { resource, bytes: new Uint8Array(bytes.slice(0)) })
+    return { ...resource }
+  }
   const directory = await getAssetsDirectory()
   const handle = await directory.getFileHandle(hash, { create: true })
   const writable = await handle.createWritable()
@@ -149,6 +186,10 @@ const putResource = async (bytes: ArrayBuffer, mediaType: string): Promise<Proje
 }
 
 const getResource = async (hash: string): Promise<ArrayBuffer | null> => {
+  if (!capabilities.opfs) {
+    const resource = transientResources.get(hash)
+    return resource ? resource.bytes.slice().buffer : null
+  }
   const directory = await getAssetsDirectory()
   try {
     const handle = await directory.getFileHandle(hash)
@@ -161,6 +202,13 @@ const getResource = async (hash: string): Promise<ArrayBuffer | null> => {
 
 const releaseResource = async (hash: string) => {
   if (!database) throw new Error('Persistence database is not initialized.')
+  if (!capabilities.opfs) {
+    const existing = transientResources.get(hash)
+    if (!existing) return
+    if (existing.resource.refCount > 1) existing.resource.refCount -= 1
+    else transientResources.delete(hash)
+    return
+  }
   const resources = database.exec({ sql: 'SELECT ref_count FROM resources WHERE hash = ?', bind: [hash], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | number>>
   const row = resources[0]
   if (!row) return
@@ -175,10 +223,12 @@ const releaseResource = async (hash: string) => {
 const handle = async (request: PersistenceRequest): Promise<PersistenceResponse> => {
   try {
     if (request.type === 'initialize') return { id: request.id, ok: true, type: 'initialized', capabilities: await initialize() }
-    if (request.type === 'dispose') { database?.close(); database = undefined; return { id: request.id, ok: true, type: 'disposed' } }
+    if (request.type === 'dispose') { database?.close(); database = undefined; transientResources.clear(); return { id: request.id, ok: true, type: 'disposed' } }
     await initialize()
+    if (request.type === 'list-projects') return { id: request.id, ok: true, type: 'projects-listed', projects: listProjects() }
     if (request.type === 'save-document') { const result = saveDocument(request.document); return { id: request.id, ok: true, type: 'saved', ...result } }
     if (request.type === 'load-document') return { id: request.id, ok: true, type: 'loaded', document: loadDocument(request.documentId) }
+    if (request.type === 'recovery-report') return { id: request.id, ok: true, type: 'recovery-report', report: recoveryReport(request.documentId) }
     if (request.type === 'put-resource') return { id: request.id, ok: true, type: 'resource-put', resource: await putResource(request.bytes, request.mediaType) }
     if (request.type === 'get-resource') return { id: request.id, ok: true, type: 'resource-get', bytes: await getResource(request.hash) }
     if (request.type === 'release-resource') { await releaseResource(request.hash); return { id: request.id, ok: true, type: 'resource-released' } }

src/facade/projectStore.ts

@@ -1,9 +1,9 @@
-import type { DocumentSnapshot, PersistenceCapabilities, ProjectResource, ProjectSaveResult } from './types'
+import type { DocumentSnapshot, PersistenceCapabilities, ProjectChangeNotice, ProjectRecoveryReport, ProjectResource, ProjectSaveResult, ProjectSummary, Unsubscribe } from './types'
 import { cloneSketch } from './sketcher'
 
-type WorkerRequest = { id: number; type: 'initialize' | 'dispose' } | { id: number; type: 'save-document'; document: DocumentSnapshot } | { id: number; type: 'load-document'; documentId: string } | { id: number; type: 'put-resource'; bytes: ArrayBuffer; mediaType: string } | { id: number; type: 'get-resource'; hash: string } | { id: number; type: 'release-resource'; hash: string }
-type WorkerInput = { type: 'initialize' | 'dispose' } | { type: 'save-document'; document: DocumentSnapshot } | { type: 'load-document'; documentId: string } | { type: 'put-resource'; bytes: ArrayBuffer; mediaType: string } | { type: 'get-resource'; hash: string } | { type: 'release-resource'; hash: string }
-type WorkerResponse = { id: number; ok: true; type: 'initialized'; capabilities: PersistenceCapabilities } | { id: number; ok: true; type: 'saved'; documentId: string; documentVersion: number; persistedAt: number; mode: PersistenceCapabilities['mode'] } | { id: number; ok: true; type: 'loaded'; document: DocumentSnapshot | null } | { id: number; ok: true; type: 'resource-put'; resource: ProjectResource } | { id: number; ok: true; type: 'resource-get'; bytes: ArrayBuffer | null } | { id: number; ok: true; type: 'resource-released' } | { id: number; ok: true; type: 'disposed' } | { id: number; ok: false; error: string }
+type WorkerRequest = { id: number; type: 'initialize' | 'dispose' | 'list-projects' } | { id: number; type: 'save-document'; document: DocumentSnapshot } | { id: number; type: 'load-document' | 'recovery-report'; documentId: string } | { id: number; type: 'put-resource'; bytes: ArrayBuffer; mediaType: string } | { id: number; type: 'get-resource'; hash: string } | { id: number; type: 'release-resource'; hash: string }
+type WorkerInput = { type: 'initialize' | 'dispose' | 'list-projects' } | { type: 'save-document'; document: DocumentSnapshot } | { type: 'load-document' | 'recovery-report'; documentId: string } | { type: 'put-resource'; bytes: ArrayBuffer; mediaType: string } | { type: 'get-resource'; hash: string } | { type: 'release-resource'; hash: string }
+type WorkerResponse = { id: number; ok: true; type: 'initialized'; capabilities: PersistenceCapabilities } | { id: number; ok: true; type: 'projects-listed'; projects: ProjectSummary[] } | { id: number; ok: true; type: 'saved'; documentId: string; documentVersion: number; persistedAt: number; mode: PersistenceCapabilities['mode'] } | { id: number; ok: true; type: 'loaded'; document: DocumentSnapshot | null } | { id: number; ok: true; type: 'recovery-report'; report: ProjectRecoveryReport } | { id: number; ok: true; type: 'resource-put'; resource: ProjectResource } | { id: number; ok: true; type: 'resource-get'; bytes: ArrayBuffer | null } | { id: number; ok: true; type: 'resource-released' } | { id: number; ok: true; type: 'disposed' } | { id: number; ok: false; error: string }
 
 const unavailable: PersistenceCapabilities = { mode: 'unavailable', sqliteWasm: false, opfs: false, schemaVersion: 0, reason: 'Persistence Worker is unavailable in this environment.' }
 const cloneDocument = (document: DocumentSnapshot): DocumentSnapshot => ({ ...document, tree: document.tree.map((item) => ({ ...item, children: item.children ? [...item.children] : undefined })), objects: document.objects.map((object) => ({ ...object, properties: object.properties.map((property) => ({ ...property, options: property.options ? [...property.options] : undefined })), sketch: object.sketch ? cloneSketch(object.sketch) : undefined })), dependencies: document.dependencies?.map((edge) => ({ ...edge })), recompute: document.recompute ? { ...document.recompute, dirtyObjects: [...document.recompute.dirtyObjects], order: [...document.recompute.order], objectStates: { ...document.recompute.objectStates }, errors: document.recompute.errors.map((error) => ({ ...error })) } : undefined })
@@ -11,8 +11,11 @@ const cloneDocument = (document: DocumentSnapshot): DocumentSnapshot => ({ ...do
 export interface ProjectPersistenceClient {
   initialize(): Promise<PersistenceCapabilities>
   capabilities(): PersistenceCapabilities
+  subscribeExternalChanges(listener: (notice: ProjectChangeNotice) => void): Unsubscribe
+  list(): Promise<ProjectSummary[]>
   save(document: DocumentSnapshot): Promise<ProjectSaveResult>
   load(documentId: string): Promise<DocumentSnapshot | null>
+  recovery(documentId: string): Promise<ProjectRecoveryReport>
   resource: {
     put(bytes: Uint8Array, mediaType: string): Promise<ProjectResource>
     get(hash: string): Promise<Uint8Array | null>
@@ -67,17 +70,27 @@ export class ProjectAutosaveScheduler {
 
 export class SqliteProjectPersistence implements ProjectPersistenceClient {
   private readonly worker: Worker | null
+  private readonly senderId = `tab-${Math.random().toString(36).slice(2)}-${Date.now().toString(36)}`
+  private readonly changeChannel: BroadcastChannel | null
+  private readonly externalChangeListeners = new Set<(notice: ProjectChangeNotice) => void>()
   private nextRequestId = 0
   private currentCapabilities = unavailable
   private initialized: Promise<PersistenceCapabilities> | null = null
-  private readonly fallbackSnapshots = new Map<string, DocumentSnapshot>()
+  private readonly fallbackSnapshots = new Map<string, { document: DocumentSnapshot; savedAt: number }>()
   private readonly fallbackResources = new Map<string, { resource: ProjectResource; bytes: Uint8Array }>()
   private readonly pending = new Map<number, { resolve: (response: WorkerResponse) => void; reject: (error: Error) => void }>()
   private readonly writeQueue = new PersistenceWriteQueue()
 
   constructor() {
     this.worker = typeof Worker === 'undefined' ? null : new Worker(new URL('./persistenceWorker.ts', import.meta.url), { type: 'module', name: 'bitbybit-persistence' })
-    if (!this.worker) this.currentCapabilities = { mode: 'sqlite-memory', sqliteWasm: false, opfs: false, schemaVersion: 0, reason: 'Worker is unavailable; using a transient in-memory project store.' }
+    this.changeChannel = typeof BroadcastChannel === 'undefined' ? null : new BroadcastChannel('bitbybit-project-changes')
+    ;(this.changeChannel as (BroadcastChannel & { unref?: () => void }) | null)?.unref?.()
+    this.changeChannel?.addEventListener('message', (event: MessageEvent<ProjectChangeNotice>) => {
+      const notice = event.data
+      if (!notice || notice.senderId === this.senderId || notice.kind !== 'document-saved') return
+      this.externalChangeListeners.forEach((listener) => listener({ ...notice }))
+    })
+    if (!this.worker) this.currentCapabilities = { mode: 'sqlite-memory', sqliteWasm: false, opfs: false, schemaVersion: 0, crossTabWriteLock: this.crossTabWriteLockMode(), reason: 'Worker is unavailable; using a transient in-memory project store.' }
     if (this.worker) {
       this.worker.onmessage = (event: MessageEvent<WorkerResponse>) => { const request = this.pending.get(event.data.id); if (!request) return; this.pending.delete(event.data.id); request.resolve(event.data) }
       this.worker.onerror = (event) => { const error = new Error(event.message || 'Persistence Worker failed.'); this.currentCapabilities = { ...unavailable, reason: error.message }; this.initialized = null; for (const request of this.pending.values()) request.reject(error); this.pending.clear() }
@@ -86,33 +99,68 @@ export class SqliteProjectPersistence implements ProjectPersistenceClient {
 
   capabilities() { return { ...this.currentCapabilities } }
 
+  subscribeExternalChanges(listener: (notice: ProjectChangeNotice) => void): Unsubscribe {
+    this.externalChangeListeners.add(listener)
+    return () => this.externalChangeListeners.delete(listener)
+  }
+
   initialize() {
     if (!this.worker) return Promise.resolve(this.currentCapabilities)
-    if (!this.initialized) this.initialized = this.request({ type: 'initialize' }).then((response) => { if (!response.ok || response.type !== 'initialized') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error); this.currentCapabilities = response.capabilities; return this.capabilities() })
+    if (!this.initialized) this.initialized = this.request({ type: 'initialize' }).then((response) => { if (!response.ok || response.type !== 'initialized') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error); this.currentCapabilities = { ...response.capabilities, crossTabWriteLock: this.crossTabWriteLockMode() }; return this.capabilities() })
     return this.initialized
   }
 
+  async list() {
+    await this.writeQueue.drain()
+    await this.initialize()
+    if (!this.worker) return [...this.fallbackSnapshots.values()].map(({ document, savedAt }) => ({ documentId: document.id, label: document.label, documentVersion: document.version, objectCount: document.objects.length, dirty: document.dirty, readOnly: document.readOnly, updatedAt: savedAt })).sort((left, right) => right.updatedAt - left.updatedAt)
+    const response = await this.request({ type: 'list-projects' })
+    if (!response.ok || response.type !== 'projects-listed') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
+    return response.projects.map((project) => ({ ...project }))
+  }
+
   save(document: DocumentSnapshot) {
-    return this.writeQueue.run(async () => {
+    return this.writeQueue.run(() => this.withCrossTabWriteLock(async () => {
       await this.initialize()
-      if (!this.worker) { const snapshot = cloneDocument(document); this.fallbackSnapshots.set(snapshot.id, snapshot); return { documentId: snapshot.id, documentVersion: snapshot.version, persistedAt: Date.now(), mode: this.currentCapabilities.mode } }
+      if (!this.worker) {
+        const snapshot = cloneDocument(document)
+        const persistedAt = Date.now()
+        this.fallbackSnapshots.set(snapshot.id, { document: snapshot, savedAt: persistedAt })
+        const result = { documentId: snapshot.id, documentVersion: snapshot.version, persistedAt, mode: this.currentCapabilities.mode }
+        this.announceSaved(result.documentId, result.documentVersion)
+        return result
+      }
       const response = await this.request({ type: 'save-document', document })
       if (!response.ok || response.type !== 'saved') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
-      return { documentId: response.documentId, documentVersion: response.documentVersion, persistedAt: response.persistedAt, mode: response.mode }
-    })
+      const result = { documentId: response.documentId, documentVersion: response.documentVersion, persistedAt: response.persistedAt, mode: response.mode }
+      this.announceSaved(result.documentId, result.documentVersion)
+      return result
+    }))
   }
 
   async load(documentId: string) {
     await this.writeQueue.drain()
     await this.initialize()
-    if (!this.worker) { const snapshot = this.fallbackSnapshots.get(documentId); return snapshot ? cloneDocument(snapshot) : null }
+    if (!this.worker) { const snapshot = this.fallbackSnapshots.get(documentId); return snapshot ? cloneDocument(snapshot.document) : null }
     const response = await this.request({ type: 'load-document', documentId })
     if (!response.ok || response.type !== 'loaded') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
     return response.document
   }
 
+  async recovery(documentId: string): Promise<ProjectRecoveryReport> {
+    await this.writeQueue.drain()
+    await this.initialize()
+    if (!this.worker) {
+      const snapshot = this.fallbackSnapshots.get(documentId)?.document
+      return { documentId, mode: this.currentCapabilities.mode, schemaVersion: this.currentCapabilities.schemaVersion, integrity: snapshot ? 'ok' : 'unavailable', lastSavedVersion: snapshot?.version ?? null, dirtyAtLastSave: snapshot?.dirty ?? null, warnings: snapshot ? [] : ['No saved snapshot exists in the transient fallback store.'] }
+    }
+    const response = await this.request({ type: 'recovery-report', documentId })
+    if (!response.ok || response.type !== 'recovery-report') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
+    return response.report
+  }
+
   readonly resource = {
-    put: (bytes: Uint8Array, mediaType: string) => this.writeQueue.run(async () => {
+    put: (bytes: Uint8Array, mediaType: string) => this.writeQueue.run(() => this.withCrossTabWriteLock(async () => {
       await this.initialize()
       if (!this.worker) {
         const hash = `memory-${[...bytes].map((value) => value.toString(16).padStart(2, '0')).join('')}`
@@ -125,7 +173,7 @@ export class SqliteProjectPersistence implements ProjectPersistenceClient {
       const response = await this.request({ type: 'put-resource', bytes: payload.buffer as ArrayBuffer, mediaType }, [payload.buffer as ArrayBuffer])
       if (!response.ok || response.type !== 'resource-put') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
       return response.resource
-    }),
+    })),
     get: async (hash: string) => {
       await this.writeQueue.drain()
       await this.initialize()
@@ -134,19 +182,37 @@ export class SqliteProjectPersistence implements ProjectPersistenceClient {
       if (!response.ok || response.type !== 'resource-get') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
       return response.bytes ? new Uint8Array(response.bytes) : null
     },
-    release: (hash: string) => this.writeQueue.run(async () => {
+    release: (hash: string) => this.writeQueue.run(() => this.withCrossTabWriteLock(async () => {
       await this.initialize()
       if (!this.worker) { const existing = this.fallbackResources.get(hash); if (!existing) return; if (existing.resource.refCount > 1) existing.resource.refCount -= 1; else this.fallbackResources.delete(hash); return }
       const response = await this.request({ type: 'release-resource', hash })
       if (!response.ok || response.type !== 'resource-released') throw new Error(response.ok ? 'Unexpected persistence response.' : response.error)
-    }),
+    })),
   }
 
   async dispose() {
     await this.writeQueue.drain()
-    if (!this.worker) return
-    await this.request({ type: 'dispose' })
-    this.worker.terminate()
+    if (this.worker) {
+      await this.request({ type: 'dispose' })
+      this.worker.terminate()
+    }
+    this.changeChannel?.close()
+  }
+
+  private crossTabWriteLockMode(): 'web-locks' | 'local-queue' {
+    return typeof navigator !== 'undefined' && 'locks' in navigator ? 'web-locks' : 'local-queue'
+  }
+
+  private withCrossTabWriteLock<T>(operation: () => Promise<T>): Promise<T> {
+    if (typeof navigator === 'undefined' || !navigator.locks) return operation()
+    return navigator.locks.request<Promise<T>>('bitbybit-project-write', { mode: 'exclusive' }, (lock) => {
+      if (!lock) throw new Error('Unable to acquire the cross-tab project write lock.')
+      return operation()
+    }).then((result) => result)
+  }
+
+  private announceSaved(documentId: string, documentVersion: number) {
+    this.changeChannel?.postMessage({ documentId, documentVersion, senderId: this.senderId, kind: 'document-saved' } satisfies ProjectChangeNotice)
   }
 
   private request(input: WorkerInput, transfer: Transferable[] = []) {

src/facade/recomputeEngine.ts

@@ -0,0 +1,378 @@
+import { DependencyGraph, type RecomputeState } from './dependencyGraph'
+import { cloneSketch, solveSketch } from './sketcher'
+import type { BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, ChamferInput, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, DocumentObjectSnapshot, DocumentSnapshot, FilletInput, PadInput, PlanarProfile, PocketInput, RevolutionInput, ShapeHandle } from './types'
+
+export type RecomputeExecutionStatus = 'completed' | 'failed' | 'cancelled' | 'stale'
+
+export type RecomputeExecutionError = {
+  objectId: string
+  code: string
+  message: string
+}
+
+export type RecomputeNodeContext = {
+  documentId: string
+  documentVersion: number
+  generation: number
+  signal: AbortSignal
+}
+
+export type RecomputeNodeResult = {
+  status: 'success' | 'suppressed' | 'failed'
+  errors?: RecomputeExecutionError[]
+  updatedObject?: DocumentObjectSnapshot
+}
+
+export type RecomputeNodeExecutor = (
+  object: DocumentObjectSnapshot,
+  document: DocumentSnapshot,
+  context: RecomputeNodeContext,
+) => Promise<RecomputeNodeResult>
+
+export type RecomputeGeometryRuntime = {
+  capabilities(): { status: string }
+  createBox(input: CreateBoxInput): Promise<ShapeHandle>
+  createCylinder(input: CreateCylinderInput): Promise<ShapeHandle>
+  createSphere(input: CreateSphereInput): Promise<ShapeHandle>
+  createCone(input: CreateConeInput): Promise<ShapeHandle>
+  union(input: BooleanUnionInput): Promise<ShapeHandle>
+  cut(input: BooleanCutInput): Promise<ShapeHandle>
+  intersection(input: BooleanIntersectionInput): Promise<ShapeHandle>
+  pad(input: PadInput): Promise<ShapeHandle>
+  pocket(input: PocketInput): Promise<ShapeHandle>
+  revolution(input: RevolutionInput): Promise<ShapeHandle>
+  fillet(input: FilletInput): Promise<ShapeHandle>
+  chamfer(input: ChamferInput): Promise<ShapeHandle>
+  release(shape: ShapeHandle): Promise<void>
+}
+
+export type RecomputeProgress = {
+  generation: number
+  documentVersion: number
+  objectId: string
+  completed: number
+  total: number
+  state: RecomputeState
+}
+
+export type RecomputeExecutionOptions = {
+  dirtyObjectIds?: string[]
+  onProgress?: (progress: RecomputeProgress) => void
+}
+
+export type RecomputeExecutionResult = {
+  generation: number
+  documentVersion: number
+  status: RecomputeExecutionStatus
+  affected: string[]
+  order: string[]
+  levels: string[][]
+  completed: string[]
+  suppressed: string[]
+  failed: string[]
+  skipped: string[]
+  dirtyObjects: string[]
+  objectStates: Record<string, RecomputeState>
+  objectUpdates: DocumentObjectSnapshot[]
+  errors: RecomputeExecutionError[]
+}
+
+const isAbortError = (error: unknown) => error instanceof Error && error.name === 'AbortError'
+
+export class RecomputeCoordinator {
+  private active: { generation: number; controller: AbortController } | null = null
+  private generation = 0
+
+  constructor(
+    private readonly executeNode: RecomputeNodeExecutor,
+    private readonly currentDocumentVersion: (documentId: string) => number | null,
+  ) {}
+
+  cancel() {
+    this.active?.controller.abort()
+  }
+
+  async run(document: DocumentSnapshot, options: RecomputeExecutionOptions = {}): Promise<RecomputeExecutionResult> {
+    this.active?.controller.abort()
+    const controller = new AbortController()
+    const generation = Math.max(this.generation, document.recompute?.generation ?? 0) + 1
+    this.generation = generation
+    this.active = { generation, controller }
+
+    const graph = new DependencyGraph(document.dependencies ?? [], document.objects.map((object) => object.id))
+    const dirtyObjectIds = options.dirtyObjectIds ?? document.recompute?.dirtyObjects ?? []
+    const plan = graph.plan(dirtyObjectIds)
+    const objectStates: Record<string, RecomputeState> = {
+      ...Object.fromEntries(document.objects.map((object) => [object.id, 'up-to-date' as const])),
+      ...(document.recompute?.objectStates ?? {}),
+    }
+    for (const objectId of plan.affected) objectStates[objectId] = 'recomputing'
+
+    const completed: string[] = []
+    const suppressed: string[] = []
+    const failed: string[] = []
+    const skipped: string[] = []
+    const errors: RecomputeExecutionError[] = []
+    const objectUpdates: DocumentObjectSnapshot[] = []
+    const objectById = new Map(document.objects.map((object) => [object.id, object]))
+
+    for (const cycle of plan.cycles) {
+      const message = `Dependency cycle: ${cycle.join(' -> ')}`
+      for (const objectId of cycle) {
+        objectStates[objectId] = 'error'
+        failed.push(objectId)
+        errors.push({ objectId, code: 'DEPENDENCY_CYCLE', message })
+      }
+    }
+
+    const terminalResult = (status: RecomputeExecutionStatus): RecomputeExecutionResult => {
+      if (status === 'cancelled' || status === 'stale') {
+        for (const objectId of plan.affected) {
+          if (objectStates[objectId] !== 'up-to-date' && objectStates[objectId] !== 'suppressed' && objectStates[objectId] !== 'upstream-suppressed') objectStates[objectId] = 'touched'
+        }
+      }
+      if (this.active?.generation === generation) this.active = null
+      return {
+        generation,
+        documentVersion: document.version,
+        status,
+        affected: plan.affected,
+        order: plan.order,
+        levels: plan.levels,
+        completed,
+        suppressed,
+        failed,
+        skipped,
+        dirtyObjects: plan.affected.filter((objectId) => objectStates[objectId] === 'touched' || objectStates[objectId] === 'recomputing' || objectStates[objectId] === 'error' || objectStates[objectId] === 'upstream-failed'),
+        objectStates,
+        objectUpdates,
+        errors,
+      }
+    }
+
+    let processed = 0
+    for (const level of plan.levels) {
+      if (controller.signal.aborted || this.active?.generation !== generation) return terminalResult('cancelled')
+      if (this.currentDocumentVersion(document.id) !== document.version) return terminalResult('stale')
+
+      // Nodes in a level have no dependencies on each other. Execute them together,
+      // then merge outcomes in plan order so persistence and UI events stay deterministic.
+      const outcomes = await Promise.all(level.map(async (objectId) => {
+        const dependencies = graph.dependenciesOf(objectId)
+        const failedDependency = dependencies.find((dependencyId) => objectStates[dependencyId] === 'error' || objectStates[dependencyId] === 'upstream-failed')
+        if (failedDependency) return { objectId, state: 'upstream-failed' as const, error: { objectId, code: 'UPSTREAM_FAILED', message: `Dependency ${failedDependency} did not recompute successfully.` } }
+        const suppressedDependency = dependencies.find((dependencyId) => objectStates[dependencyId] === 'suppressed' || objectStates[dependencyId] === 'upstream-suppressed')
+        if (suppressedDependency) return { objectId, state: 'upstream-suppressed' as const }
+
+        const object = objectById.get(objectId)
+        if (!object) return { objectId, state: 'error' as const, error: { objectId, code: 'OBJECT_NOT_FOUND', message: `Document object does not exist: ${objectId}` } }
+
+        try {
+          const result = await this.executeNode(object, document, {
+            documentId: document.id,
+            documentVersion: document.version,
+            generation,
+            signal: controller.signal,
+          })
+          if (result.status === 'failed') {
+            return {
+              objectId,
+              state: 'error' as const,
+              errors: result.errors?.length ? result.errors : [{ objectId, code: 'RECOMPUTE_FAILED', message: `${objectId} failed to recompute.` }],
+            }
+          }
+          if (result.status === 'suppressed') return { objectId, state: 'suppressed' as const }
+          return { objectId, state: 'up-to-date' as const, updatedObject: result.updatedObject }
+        } catch (error) {
+          if (controller.signal.aborted || isAbortError(error)) return { objectId, state: 'cancelled' as const }
+          return { objectId, state: 'error' as const, error: { objectId, code: 'RECOMPUTE_EXCEPTION', message: error instanceof Error ? error.message : String(error) } }
+        }
+      }))
+
+      if (controller.signal.aborted || this.active?.generation !== generation) return terminalResult('cancelled')
+      if (this.currentDocumentVersion(document.id) !== document.version) return terminalResult('stale')
+
+      for (const outcome of outcomes) {
+        if (outcome.state === 'cancelled') return terminalResult('cancelled')
+        objectStates[outcome.objectId] = outcome.state
+        processed += 1
+        if (outcome.state === 'up-to-date') {
+          completed.push(outcome.objectId)
+          if (outcome.updatedObject) objectUpdates.push(outcome.updatedObject)
+        } else if (outcome.state === 'suppressed') {
+          suppressed.push(outcome.objectId)
+          skipped.push(outcome.objectId)
+        } else if (outcome.state === 'upstream-suppressed') {
+          skipped.push(outcome.objectId)
+        } else if (outcome.state === 'upstream-failed') {
+          skipped.push(outcome.objectId)
+          if (outcome.error) errors.push(outcome.error)
+        } else {
+          failed.push(outcome.objectId)
+          if ('errors' in outcome && outcome.errors) errors.push(...outcome.errors)
+          else if (outcome.error) errors.push(outcome.error)
+        }
+        options.onProgress?.({ generation, documentVersion: document.version, objectId: outcome.objectId, completed: processed, total: plan.order.length, state: outcome.state })
+      }
+    }
+
+    if (this.active?.generation === generation) this.active = null
+    return terminalResult(errors.length > 0 ? 'failed' : 'completed')
+  }
+}
+
+export const executeFacadeRecomputeNode: RecomputeNodeExecutor = async (object, _document, context) => {
+  if (context.signal.aborted) throw new DOMException('Recompute cancelled.', 'AbortError')
+  if (object.properties.some((property) => property.name === 'Suppressed' && property.value === true)) return { status: 'suppressed' }
+  const expressionError = object.properties.find((property) => property.expressionError)
+  if (expressionError) {
+    return {
+      status: 'failed',
+      errors: [{ objectId: object.id, code: 'EXPRESSION_ERROR', message: expressionError.expressionError as string }],
+    }
+  }
+  if (!object.sketch) return { status: 'success' }
+
+  const solved = solveSketch(object.sketch)
+  if (solved.status === 'conflicting' || solved.status === 'invalid') {
+    return {
+      status: 'failed',
+      errors: solved.diagnostics.map((diagnostic) => ({ objectId: object.id, code: diagnostic.code, message: diagnostic.message })),
+    }
+  }
+  const updatedObject: DocumentObjectSnapshot = {
+    ...object,
+    properties: object.properties.map((property) => property.name === 'ConstraintStatus'
+      ? { ...property, value: solved.status === 'solved' ? 'Fully constrained' : `Under-constrained (${solved.degreesOfFreedom} DOF)` }
+      : { ...property, options: property.options ? [...property.options] : undefined }),
+    sketch: cloneSketch(solved.snapshot),
+  }
+  return { status: 'success', updatedObject }
+}
+
+const propertyValue = (object: DocumentObjectSnapshot, name: string) => object.properties.find((property) => property.name === name)?.value
+const linkedObject = (object: DocumentObjectSnapshot, name: string, document: DocumentSnapshot) => {
+  const value = propertyValue(object, name)
+  return typeof value === 'string' ? document.objects.find((candidate) => candidate.id === value) : undefined
+}
+
+const pointsEqual = (left: [number, number, number], right: [number, number, number], tolerance = 1e-7) => left.every((value, index) => Math.abs(value - right[index]) <= tolerance)
+
+const sketchProfile = (sketch: DocumentObjectSnapshot['sketch']): { profile?: PlanarProfile; code?: string; message?: string } => {
+  if (!sketch) return { code: 'PROFILE_MISSING', message: 'Feature profile does not reference a Sketcher object.' }
+  const geometry = sketch.geometry.filter((candidate) => !candidate.construction)
+  if (geometry.some((candidate) => candidate.type !== 'line')) return { code: 'PROFILE_UNSUPPORTED', message: 'OCCT feature recompute currently requires a closed line-loop sketch profile.' }
+  const segments = geometry.filter((candidate): candidate is Extract<typeof candidate, { type: 'line' }> => candidate.type === 'line')
+  if (segments.length < 3) return { code: 'PROFILE_OPEN', message: 'Feature profile requires at least three connected line segments.' }
+
+  const first = segments[0]
+  const ring: [number, number, number][] = [[first.start.x, first.start.y, 0]]
+  let current: [number, number, number] = [first.end.x, first.end.y, 0]
+  const remaining = segments.slice(1)
+  while (remaining.length > 0 && !pointsEqual(current, ring[0])) {
+    const index = remaining.findIndex((segment) => pointsEqual([segment.start.x, segment.start.y, 0], current) || pointsEqual([segment.end.x, segment.end.y, 0], current))
+    if (index < 0) return { code: 'PROFILE_OPEN', message: 'Feature profile line segments do not form a closed loop.' }
+    const segment = remaining.splice(index, 1)[0]
+    if (pointsEqual([segment.start.x, segment.start.y, 0], current)) current = [segment.end.x, segment.end.y, 0]
+    else current = [segment.start.x, segment.start.y, 0]
+    ring.push(current)
+  }
+  if (!pointsEqual(current, ring[0]) || remaining.length > 0) return { code: 'PROFILE_OPEN', message: 'Feature profile line segments do not form one closed loop.' }
+  ring.pop()
+  return { profile: { outer: ring } }
+}
+
+const geometryFailure = (objectId: string, code: string, message: string): RecomputeNodeResult => ({ status: 'failed', errors: [{ objectId, code, message }] })
+
+/**
+ * Adds real OCCT feature execution without putting transient ShapeHandles in the
+ * persisted document snapshot. The map is deliberately owned by the Facade and
+ * keeps the last successful shape when a later feature fails.
+ */
+export const createFacadeGeometryRecomputeExecutor = (
+  geometry: RecomputeGeometryRuntime,
+  shapes: Map<string, ShapeHandle> = new Map(),
+): RecomputeNodeExecutor => async (object, document, context) => {
+  const base = await executeFacadeRecomputeNode(object, document, context)
+  if (base.status === 'suppressed') {
+    const previous = shapes.get(object.id)
+    shapes.delete(object.id)
+    if (previous) await geometry.release(previous)
+    return base
+  }
+  if (base.status === 'failed' || object.sketch || geometry.capabilities().status !== 'ready') return base
+  if (!['Part::Box', 'Part::Cylinder', 'Part::Sphere', 'Part::Cone', 'Part::Fuse', 'Part::Cut', 'Part::Common', 'PartDesign::Pad', 'PartDesign::Pocket', 'PartDesign::Revolution', 'PartDesign::Fillet', 'PartDesign::Chamfer'].includes(object.typeId)) return base
+
+  const requiresProfile = object.typeId === 'PartDesign::Pad' || object.typeId === 'PartDesign::Pocket' || object.typeId === 'PartDesign::Revolution'
+  const profileObject = requiresProfile ? linkedObject(object, 'Profile', document) : undefined
+  const profile = requiresProfile ? sketchProfile(profileObject?.sketch) : { profile: undefined }
+  if (requiresProfile && !profile.profile) return geometryFailure(object.id, profile.code || 'PROFILE_INVALID', profile.message || 'Feature profile is invalid.')
+  if (context.signal.aborted) throw new DOMException('Recompute cancelled.', 'AbortError')
+
+  const numberProperty = (name: string, fallback: number) => {
+    const value = propertyValue(object, name)
+    return typeof value === 'number' && Number.isFinite(value) ? value : fallback
+  }
+  const documentContext = { documentId: context.documentId, documentVersion: context.documentVersion }
+  try {
+    let result: ShapeHandle
+    if (object.typeId === 'Part::Box') {
+      result = await geometry.createBox({ ...documentContext, width: numberProperty('Width', 10), length: numberProperty('Length', 10), height: numberProperty('Height', 10) })
+    } else if (object.typeId === 'Part::Cylinder') {
+      result = await geometry.createCylinder({ ...documentContext, radius: numberProperty('Radius', 5), height: numberProperty('Height', 10), angle: numberProperty('Angle', 360) })
+    } else if (object.typeId === 'Part::Sphere') {
+      result = await geometry.createSphere({ ...documentContext, radius: numberProperty('Radius', 5) })
+    } else if (object.typeId === 'Part::Cone') {
+      result = await geometry.createCone({ ...documentContext, radius1: numberProperty('Radius1', 5), radius2: numberProperty('Radius2', 0), height: numberProperty('Height', 10), angle: numberProperty('Angle', 360) })
+    } else if (object.typeId === 'Part::Fuse' || object.typeId === 'Part::Cut' || object.typeId === 'Part::Common') {
+      const baseObject = linkedObject(object, 'Base', document)
+      const toolObject = linkedObject(object, 'Tool', document)
+      const baseShape = baseObject ? shapes.get(baseObject.id) : undefined
+      const toolShape = toolObject ? shapes.get(toolObject.id) : undefined
+      if (!baseShape || !toolShape) return geometryFailure(object.id, 'BOOLEAN_SHAPE_MISSING', 'Boolean operation requires recomputed Base and Tool shapes.')
+      if (object.typeId === 'Part::Fuse') result = await geometry.union({ ...documentContext, shapes: [baseShape, toolShape] })
+      else if (object.typeId === 'Part::Cut') result = await geometry.cut({ ...documentContext, base: baseShape, tools: [toolShape] })
+      else result = await geometry.intersection({ ...documentContext, shapes: [baseShape, toolShape] })
+    } else if (object.typeId === 'PartDesign::Pad') {
+      result = await geometry.pad({ ...documentContext, profile: profile.profile as PlanarProfile, length: numberProperty('Length', 1), direction: [0, 0, 1], reversed: propertyValue(object, 'Reversed') === true, symmetricToPlane: propertyValue(object, 'Midplane') === true })
+    } else if (object.typeId === 'PartDesign::Pocket') {
+      const pocketType = propertyValue(object, 'Type')
+      if (pocketType === 'Up to face') return geometryFailure(object.id, 'UP_TO_FACE_UNSUPPORTED', 'Pocket Up to face requires a persistent support face and is not implemented yet.')
+      const baseObject = linkedObject(object, 'Base', document)
+      const baseShape = baseObject ? shapes.get(baseObject.id) : undefined
+      if (!baseShape) return geometryFailure(object.id, 'BASE_SHAPE_MISSING', 'Pocket base has no valid recomputed Shape.')
+      result = await geometry.pocket({ ...documentContext, base: baseShape, profile: profile.profile as PlanarProfile, length: numberProperty('Length', 1), direction: [0, 0, 1], reversed: propertyValue(object, 'Reversed') === true, throughAll: pocketType === 'Through all' })
+    } else if (object.typeId === 'PartDesign::Revolution') {
+      const angle = numberProperty('Angle', 360)
+      const reversed = propertyValue(object, 'Reversed') === true
+      result = await geometry.revolution({
+        ...documentContext,
+        profile: profile.profile as PlanarProfile,
+        angle,
+        axisOrigin: [0, 0, 0],
+        axisDirection: reversed ? [0, -1, 0] : [0, 1, 0],
+      })
+    } else if (object.typeId === 'PartDesign::Fillet') {
+      const baseObject = linkedObject(object, 'Base', document)
+      const baseShape = baseObject ? shapes.get(baseObject.id) : undefined
+      if (!baseShape) return geometryFailure(object.id, 'BASE_SHAPE_MISSING', 'Fillet base has no valid recomputed Shape.')
+      result = await geometry.fillet({ ...documentContext, base: baseShape, radius: numberProperty('Radius', 1) })
+    } else {
+      const baseObject = linkedObject(object, 'Base', document)
+      const baseShape = baseObject ? shapes.get(baseObject.id) : undefined
+      if (!baseShape) return geometryFailure(object.id, 'BASE_SHAPE_MISSING', 'Chamfer base has no valid recomputed Shape.')
+      result = await geometry.chamfer({ ...documentContext, base: baseShape, distance: numberProperty('Distance', 1) })
+    }
+    if (context.signal.aborted) {
+      await geometry.release(result)
+      throw new DOMException('Recompute cancelled.', 'AbortError')
+    }
+    const previous = shapes.get(object.id)
+    shapes.set(object.id, result)
+    if (previous && previous.id !== result.id) await geometry.release(previous)
+    return base
+  } catch (error) {
+    if (context.signal.aborted || isAbortError(error)) throw error
+    return geometryFailure(object.id, 'GEOMETRY_EXECUTION_FAILED', error instanceof Error ? error.message : String(error))
+  }
+}

src/facade/sketcher.ts

@@ -6,15 +6,18 @@ export type SketchGeometry =
   | { id: string; type: 'circle'; center: SketchPoint; radius: number; construction?: boolean }
   | { id: string; type: 'arc'; center: SketchPoint; radius: number; startAngle: number; endAngle: number; construction?: boolean }
 
-export type SketchPointRef = { geometryId: string; point: 'start' | 'end' | 'center' }
+export type SketchPointRef = { geometryId: string; point: 'start' | 'end' | 'center' | 'position' }
 
 export type SketchConstraint =
   | { id: string; type: 'coincident'; first: SketchPointRef; second: SketchPointRef; driving?: boolean }
   | { id: string; type: 'horizontal' | 'vertical'; geometryId: string; driving?: boolean }
   | { id: string; type: 'distance' | 'distanceX' | 'distanceY'; first: SketchPointRef; second: SketchPointRef; value: number; driving?: boolean }
   | { id: string; type: 'radius'; geometryId: string; value: number; driving?: boolean }
+  | { id: string; type: 'diameter'; geometryId: string; value: number; driving?: boolean }
   | { id: string; type: 'angle'; geometryId: string; value: number; driving?: boolean }
   | { id: string; type: 'equal'; firstGeometryId: string; secondGeometryId: string; driving?: boolean }
+  | { id: string; type: 'symmetric'; first: SketchPointRef; second: SketchPointRef; center: SketchPointRef; driving?: boolean }
+  | { id: string; type: 'tangent'; firstGeometryId: string; secondGeometryId: string; driving?: boolean }
   | { id: string; type: 'block'; geometryId: string; driving?: boolean }
 
 export type SketchSolverStatus = 'solved' | 'under-constrained' | 'conflicting' | 'invalid'
@@ -80,7 +83,7 @@ const findGeometry = (geometry: SketchGeometry[], id: string, constraintId: stri
 }
 
 const pointFor = (geometry: SketchGeometry, point: SketchPointRef['point'], constraintId: string, diagnostics: SketchDiagnostic[]): SketchPoint | null => {
-  if (geometry.type === 'point') return geometry.position
+  if (geometry.type === 'point' && point === 'position') return geometry.position
   if (geometry.type === 'line' && (point === 'start' || point === 'end')) return point === 'start' ? geometry.start : geometry.end
   if ((geometry.type === 'circle' || geometry.type === 'arc') && point === 'center') return geometry.center
   diagnostics.push({ code: 'UNKNOWN_POINT', constraintId, message: `Point '${point}' is not valid for ${geometry.type} '${geometry.id}'.` })
@@ -91,6 +94,15 @@ const pointKey = (ref: SketchPointRef) => `${ref.geometryId}.${ref.point}`
 const distance = (left: SketchPoint, right: SketchPoint) => Math.hypot(left.x - right.x, left.y - right.y)
 const lineLength = (geometry: SketchGeometry) => geometry.type === 'line' ? distance(geometry.start, geometry.end) : geometry.type === 'circle' || geometry.type === 'arc' ? geometry.radius : 0
 
+const lineCircleTangentResidual = (line: SketchGeometry, circle: SketchGeometry) => {
+  if (line.type !== 'line' || (circle.type !== 'circle' && circle.type !== 'arc')) return Infinity
+  const dx = line.end.x - line.start.x
+  const dy = line.end.y - line.start.y
+  const length = Math.hypot(dx, dy)
+  if (length === 0) return Infinity
+  return Math.abs(((circle.center.x - line.start.x) * dy - (circle.center.y - line.start.y) * dx) / length) - circle.radius
+}
+
 const isBlocked = (geometryId: string, blocked: Set<string>) => blocked.has(geometryId)
 
 const adjustPoint = (geometry: SketchGeometry, point: SketchPointRef['point'], next: SketchPoint, blocked: Set<string>) => {
@@ -114,6 +126,10 @@ const residualFor = (constraint: SketchConstraint, geometry: SketchGeometry[], d
     const candidate = findGeometry(geometry, constraint.geometryId, constraint.id, diagnostics)
     return candidate && (candidate.type === 'circle' || candidate.type === 'arc') ? Math.abs(candidate.radius - constraint.value) : Infinity
   }
+  if (constraint.type === 'diameter') {
+    const candidate = findGeometry(geometry, constraint.geometryId, constraint.id, diagnostics)
+    return candidate && (candidate.type === 'circle' || candidate.type === 'arc') ? Math.abs(candidate.radius * 2 - constraint.value) : Infinity
+  }
   if (constraint.type === 'angle') {
     const candidate = findGeometry(geometry, constraint.geometryId, constraint.id, diagnostics)
     if (!candidate || candidate.type !== 'line') return Infinity
@@ -124,6 +140,25 @@ const residualFor = (constraint: SketchConstraint, geometry: SketchGeometry[], d
     const second = findGeometry(geometry, constraint.secondGeometryId, constraint.id, diagnostics)
     return first && second ? Math.abs(lineLength(first) - lineLength(second)) : Infinity
   }
+  if (constraint.type === 'symmetric') {
+    const firstGeometry = findGeometry(geometry, constraint.first.geometryId, constraint.id, diagnostics)
+    const secondGeometry = findGeometry(geometry, constraint.second.geometryId, constraint.id, diagnostics)
+    const centerGeometry = findGeometry(geometry, constraint.center.geometryId, constraint.id, diagnostics)
+    if (!firstGeometry || !secondGeometry || !centerGeometry) return Infinity
+    const first = pointFor(firstGeometry, constraint.first.point, constraint.id, diagnostics)
+    const second = pointFor(secondGeometry, constraint.second.point, constraint.id, diagnostics)
+    const center = pointFor(centerGeometry, constraint.center.point, constraint.id, diagnostics)
+    return first && second && center ? Math.hypot((first.x + second.x) / 2 - center.x, (first.y + second.y) / 2 - center.y) : Infinity
+  }
+  if (constraint.type === 'tangent') {
+    const first = findGeometry(geometry, constraint.firstGeometryId, constraint.id, diagnostics)
+    const second = findGeometry(geometry, constraint.secondGeometryId, constraint.id, diagnostics)
+    if (!first || !second) return Infinity
+    if (first.type === 'line' && (second.type === 'circle' || second.type === 'arc')) return Math.abs(lineCircleTangentResidual(first, second))
+    if (second.type === 'line' && (first.type === 'circle' || first.type === 'arc')) return Math.abs(lineCircleTangentResidual(second, first))
+    if ((first.type === 'circle' || first.type === 'arc') && (second.type === 'circle' || second.type === 'arc')) return Math.abs(distance(first.center, second.center) - first.radius - second.radius)
+    return Infinity
+  }
   if (constraint.type === 'block') return 0
   if (constraint.type !== 'coincident' && constraint.type !== 'distance' && constraint.type !== 'distanceX' && constraint.type !== 'distanceY') return Infinity
   const firstGeometry = findGeometry(geometry, constraint.first.geometryId, constraint.id, diagnostics)
@@ -162,6 +197,10 @@ export const solveSketch = (input: SketchSnapshot, options: SketchSolveOptions =
         const candidate = geometryById.get(constraint.geometryId)
         if (!candidate || (candidate.type !== 'circle' && candidate.type !== 'arc')) { findGeometry(snapshot.geometry, constraint.geometryId, constraint.id, diagnostics); continue }
         if (!isBlocked(candidate.id, blocked)) candidate.radius = constraint.value
+      } else if (constraint.type === 'diameter') {
+        const candidate = geometryById.get(constraint.geometryId)
+        if (!candidate || (candidate.type !== 'circle' && candidate.type !== 'arc')) { findGeometry(snapshot.geometry, constraint.geometryId, constraint.id, diagnostics); continue }
+        if (!isBlocked(candidate.id, blocked)) candidate.radius = constraint.value / 2
       } else if (constraint.type === 'coincident' || constraint.type === 'distance' || constraint.type === 'distanceX' || constraint.type === 'distanceY') {
         const firstGeometry = geometryById.get(constraint.first.geometryId)
         const secondGeometry = geometryById.get(constraint.second.geometryId)
@@ -188,6 +227,38 @@ export const solveSketch = (input: SketchSnapshot, options: SketchSolveOptions =
             else adjustPoint(secondGeometry, constraint.second.point, { x: second.x, y: first.y + (dy < 0 ? -constraint.value : constraint.value) }, blocked)
           }
         }
+      } else if (constraint.type === 'symmetric') {
+        const firstGeometry = geometryById.get(constraint.first.geometryId)
+        const secondGeometry = geometryById.get(constraint.second.geometryId)
+        const centerGeometry = geometryById.get(constraint.center.geometryId)
+        if (!firstGeometry || !secondGeometry || !centerGeometry) { findGeometry(snapshot.geometry, !firstGeometry ? constraint.first.geometryId : !secondGeometry ? constraint.second.geometryId : constraint.center.geometryId, constraint.id, diagnostics); continue }
+        const first = pointFor(firstGeometry, constraint.first.point, constraint.id, diagnostics)
+        const second = pointFor(secondGeometry, constraint.second.point, constraint.id, diagnostics)
+        const center = pointFor(centerGeometry, constraint.center.point, constraint.id, diagnostics)
+        if (!first || !second || !center) continue
+        const reflected = { x: 2 * center.x - first.x, y: 2 * center.y - first.y }
+        if (!isBlocked(secondGeometry.id, blocked)) adjustPoint(secondGeometry, constraint.second.point, reflected, blocked)
+      } else if (constraint.type === 'tangent') {
+        const first = geometryById.get(constraint.firstGeometryId)
+        const second = geometryById.get(constraint.secondGeometryId)
+        if (!first || !second) { findGeometry(snapshot.geometry, !first ? constraint.firstGeometryId : constraint.secondGeometryId, constraint.id, diagnostics); continue }
+        const line = first.type === 'line' ? first : second.type === 'line' ? second : null
+        const circle = first.type === 'line' ? second : second.type === 'line' ? first : null
+        if (line && circle && (circle.type === 'circle' || circle.type === 'arc') && !isBlocked(circle.id, blocked)) {
+          const dx = line.end.x - line.start.x
+          const dy = line.end.y - line.start.y
+          const length = Math.hypot(dx, dy) || 1
+          const signed = ((circle.center.x - line.start.x) * dy - (circle.center.y - line.start.y) * dx) / length
+          const delta = circle.radius - Math.abs(signed)
+          const sign = signed < 0 ? -1 : 1
+          circle.center = { x: circle.center.x + dy / length * delta * sign, y: circle.center.y - dx / length * delta * sign }
+        } else if (first && second && (first.type === 'circle' || first.type === 'arc') && (second.type === 'circle' || second.type === 'arc') && !isBlocked(second.id, blocked)) {
+          const dx = second.center.x - first.center.x
+          const dy = second.center.y - first.center.y
+          const length = Math.hypot(dx, dy) || 1
+          const target = first.radius + second.radius
+          second.center = { x: first.center.x + dx / length * target, y: first.center.y + dy / length * target }
+        }
       } else if (constraint.type === 'equal') {
         const first = geometryById.get(constraint.firstGeometryId)
         const second = geometryById.get(constraint.secondGeometryId)

src/facade/topologyNaming.ts

@@ -7,7 +7,7 @@ export type FaceMeshInput = {
 }
 
 export type SubshapeSignature = {
-  kind: 'face'
+  kind: 'face' | 'edge' | 'vertex'
   canonical: string
   hash: string
   centroid: [number, number, number]
@@ -72,6 +72,59 @@ export const signatureForFace = (face: FaceMeshInput, tolerance = 1e-5): Subshap
   return { kind: 'face', canonical, hash: hashString(canonical), centroid, bounds: { min, max }, area, normal }
 }
 
+const pointCanonical = (point: [number, number, number], tolerance: number) => point.map((value) => quantize(value, tolerance)).join(',')
+
+export const signatureForEdge = (start: [number, number, number], end: [number, number, number], tolerance = 1e-5): SubshapeSignature => {
+  if (![...start, ...end].every(Number.isFinite)) throw new RangeError('An edge signature requires finite endpoint coordinates.')
+  const ordered = pointCanonical(start, tolerance) <= pointCanonical(end, tolerance) ? [start, end] : [end, start]
+  const midpoint: [number, number, number] = [(ordered[0][0] + ordered[1][0]) / 2, (ordered[0][1] + ordered[1][1]) / 2, (ordered[0][2] + ordered[1][2]) / 2]
+  const length = Math.hypot(ordered[1][0] - ordered[0][0], ordered[1][1] - ordered[0][1], ordered[1][2] - ordered[0][2])
+  const min: [number, number, number] = [Math.min(ordered[0][0], ordered[1][0]), Math.min(ordered[0][1], ordered[1][1]), Math.min(ordered[0][2], ordered[1][2])]
+  const max: [number, number, number] = [Math.max(ordered[0][0], ordered[1][0]), Math.max(ordered[0][1], ordered[1][1]), Math.max(ordered[0][2], ordered[1][2])]
+  const canonical = ['edge', `ends=${pointCanonical(ordered[0], tolerance)}:${pointCanonical(ordered[1], tolerance)}`, `length=${quantize(length, tolerance)}`].join('|')
+  return { kind: 'edge', canonical, hash: hashString(canonical), centroid: midpoint, bounds: { min, max }, area: 0, normal: [0, 0, 0] }
+}
+
+export const signatureForVertex = (point: [number, number, number], tolerance = 1e-5): SubshapeSignature => {
+  if (!point.every(Number.isFinite)) throw new RangeError('A vertex signature requires finite coordinates.')
+  const canonical = `vertex|point=${pointCanonical(point, tolerance)}`
+  return { kind: 'vertex', canonical, hash: hashString(canonical), centroid: [...point] as [number, number, number], bounds: { min: [...point] as [number, number, number], max: [...point] as [number, number, number] }, area: 0, normal: [0, 0, 0] }
+}
+
+const refsForSignatures = (shapeId: string, topologyVersion: number, signatures: SubshapeSignature[]): SubshapeRef[] => {
+  const occurrences = new Map<string, number>()
+  signatures.forEach((signature) => occurrences.set(`${signature.kind}:${signature.hash}`, (occurrences.get(`${signature.kind}:${signature.hash}`) ?? 0) + 1))
+  return signatures.map((signature) => {
+    const key = `${signature.kind}:${signature.hash}`
+    const duplicate = (occurrences.get(key) ?? 0) > 1
+    const persistentId = `topo-${signature.kind}-${signature.hash}`
+    return { shapeId, kind: signature.kind, persistentId, topologyVersion, status: duplicate ? 'ambiguous' as const : 'stable' as const, signature: signature.canonical, candidates: duplicate ? signatures.filter((candidate) => candidate.kind === signature.kind && candidate.hash === signature.hash).map((candidate) => `topo-${candidate.kind}-${candidate.hash}`) : undefined }
+  })
+}
+
+export const createEdgeSubshapeRefs = (shapeId: string, topologyVersion: number, faces: FaceMeshInput[], tolerance = 1e-5): { refs: SubshapeRef[]; signatures: SubshapeSignature[] } => {
+  const signatures = new Map<string, SubshapeSignature>()
+  for (const face of faces) for (let index = 0; index + 2 < face.triIndexes.length; index += 3) {
+    const points = [facePoint(face.vertexCoord, face.triIndexes[index]), facePoint(face.vertexCoord, face.triIndexes[index + 1]), facePoint(face.vertexCoord, face.triIndexes[index + 2])]
+    for (let edgeIndex = 0; edgeIndex < 3; edgeIndex += 1) {
+      const signature = signatureForEdge(points[edgeIndex], points[(edgeIndex + 1) % 3], tolerance)
+      signatures.set(signature.hash, signature)
+    }
+  }
+  const values = [...signatures.values()]
+  return { refs: refsForSignatures(shapeId, topologyVersion, values), signatures: values }
+}
+
+export const createVertexSubshapeRefs = (shapeId: string, topologyVersion: number, faces: FaceMeshInput[], tolerance = 1e-5): { refs: SubshapeRef[]; signatures: SubshapeSignature[] } => {
+  const signatures = new Map<string, SubshapeSignature>()
+  for (const face of faces) for (let index = 0; index < face.vertexCoord.length; index += 3) {
+    const signature = signatureForVertex(facePoint(face.vertexCoord, index / 3), tolerance)
+    signatures.set(signature.hash, signature)
+  }
+  const values = [...signatures.values()]
+  return { refs: refsForSignatures(shapeId, topologyVersion, values), signatures: values }
+}
+
 export const createSubshapeRefs = (shapeId: string, topologyVersion: number, faces: FaceMeshInput[], tolerance = 1e-5): { refs: SubshapeRef[]; signatures: SubshapeSignature[] } => {
   const signatures = faces.map((face) => signatureForFace(face, tolerance))
   const occurrences = new Map<string, number>()
@@ -107,5 +160,6 @@ export const matchSubshapes = (previous: Array<{ ref: SubshapeRef; signature: Su
       matches.push({ current: { ...candidate.ref, status: 'ambiguous', candidates: [best.entry.ref.persistentId, second.entry.ref.persistentId] }, score: best.score, status: 'ambiguous' })
     } else matches.push({ current: { ...candidate.ref, status: 'new' }, score: best?.score ?? 0, status: 'new' })
   }
+  for (const entry of previous) if (!used.has(entry.ref.persistentId)) matches.push({ current: { ...entry.ref, status: 'deleted' }, previousId: entry.ref.persistentId, score: 0, status: 'deleted' })
   return matches
 }

src/facade/types.ts

@@ -2,6 +2,8 @@ import type { CommandDefinition, WorkbenchId } from '../freecadManifest'
 import type { DependencyEdge, RecomputeSnapshot, RecomputePlan } from './dependencyGraph'
 import type { Quantity, QuantityDimension } from './units'
 import type { SketchConstraint, SketchGeometry, SketchSnapshot, SketchSolveResult } from './sketcher'
+import type { RecomputeExecutionOptions, RecomputeExecutionResult } from './recomputeEngine'
+import type { FcstdArchiveLimits, FcstdInspection } from './fcstd'
 
 export type ModelTreeItem = {
   id: string
@@ -19,7 +21,7 @@ export type ObjectPropertySnapshot = {
   label: string
   group: string
   scope: 'data' | 'view'
-  type: 'App::PropertyString' | 'App::PropertyLength' | 'App::PropertyBool' | 'App::PropertyEnumeration' | 'App::PropertyLink' | 'App::PropertyColor' | 'App::PropertyPercent' | 'App::PropertyFloat'
+  type: 'App::PropertyString' | 'App::PropertyLength' | 'App::PropertyAngle' | 'App::PropertyBool' | 'App::PropertyEnumeration' | 'App::PropertyLink' | 'App::PropertyColor' | 'App::PropertyPercent' | 'App::PropertyFloat'
   value: PropertyValue
   unit?: string
   readOnly?: boolean
@@ -73,9 +75,17 @@ export type PersistenceCapabilities = {
   sqliteWasm: boolean
   opfs: boolean
   schemaVersion: number
+  crossTabWriteLock?: 'web-locks' | 'local-queue'
   reason?: string
 }
 
+export type ProjectChangeNotice = {
+  documentId: string
+  documentVersion: number
+  senderId: string
+  kind: 'document-saved'
+}
+
 export type ProjectSaveResult = {
   documentId: string
   documentVersion: number
@@ -83,6 +93,26 @@ export type ProjectSaveResult = {
   mode: PersistenceCapabilities['mode']
 }
 
+export type ProjectSummary = {
+  documentId: string
+  label: string
+  documentVersion: number
+  objectCount: number
+  dirty: boolean
+  readOnly: boolean
+  updatedAt: number
+}
+
+export type ProjectRecoveryReport = {
+  documentId: string
+  mode: PersistenceCapabilities['mode']
+  schemaVersion: number
+  integrity: 'ok' | 'failed' | 'unavailable'
+  lastSavedVersion: number | null
+  dirtyAtLastSave: boolean | null
+  warnings: string[]
+}
+
 export type ProjectResource = {
   hash: string
   byteLength: number
@@ -117,6 +147,12 @@ export type SubshapeRef = {
   candidates?: string[]
 }
 
+export type SubshapeTopology = {
+  faces: SubshapeRef[]
+  edges: SubshapeRef[]
+  vertices: SubshapeRef[]
+}
+
 export type MeshAsset = {
   shapeId: string
   topologyVersion: number
@@ -231,6 +267,7 @@ export type PadInput = GeometryDocumentContext & LinearFeatureParameters
 
 export type PocketInput = GeometryDocumentContext & LinearFeatureParameters & {
   base: ShapeHandle
+  throughAll?: boolean
 }
 
 export type RevolutionInput = GeometryDocumentContext & {
@@ -313,10 +350,13 @@ export interface BitBybitWebCadFacade {
       getActive(): DocumentSnapshot
       getObject(objectId: string): DocumentObjectSnapshot | null
       create(label?: string): DocumentSnapshot
+      load(documentId: string): Promise<DocumentSnapshot | null>
       markDirty(): void
       setProperty(input: SetPropertyInput): void
       setExpression(input: SetExpressionInput): void
       recompute(): RecomputeResult
+      recomputeAsync(options?: RecomputeExecutionOptions): Promise<RecomputeExecutionResult>
+      cancelRecompute(): void
       getDependencies(): DependencyEdge[]
     }
     expression: {
@@ -362,8 +402,14 @@ export interface BitBybitWebCadFacade {
   }
   readonly project: {
     capabilities(): PersistenceCapabilities
+    subscribeExternalChanges(listener: (notice: ProjectChangeNotice) => void): Unsubscribe
+    list(): Promise<ProjectSummary[]>
     save(document?: DocumentSnapshot): Promise<ProjectSaveResult>
     load(documentId: string): Promise<DocumentSnapshot | null>
+    recovery(documentId: string): Promise<ProjectRecoveryReport>
+    fcstd: {
+      inspect(bytes: Uint8Array, limits?: Partial<FcstdArchiveLimits>): FcstdInspection
+    }
     resource: {
       put(bytes: Uint8Array, mediaType: string): Promise<ProjectResource>
       get(hash: string): Promise<Uint8Array | null>
@@ -390,6 +436,8 @@ export interface BitBybitWebCadFacade {
     revolution(input: RevolutionInput): Promise<ShapeHandle>
     mesh(shape: ShapeHandle, precision?: number): Promise<MeshAsset>
     subshapes(shape: ShapeHandle, precision?: number): Promise<SubshapeRef[]>
+    topology(shape: ShapeHandle, precision?: number): Promise<SubshapeTopology>
+    getObjectShape(objectId: string): ShapeHandle | null
     release(shape: ShapeHandle): Promise<void>
     dispose(): void
   }

src/facade/units.ts

@@ -18,6 +18,12 @@ const definitions: UnitDefinition[] = [
   { id: 'm', symbol: 'm', dimension: 'length', factor: 1000 },
   { id: 'in', symbol: 'in', dimension: 'length', factor: 25.4 },
   { id: 'ft', symbol: 'ft', dimension: 'length', factor: 304.8 },
+  { id: 'mm2', symbol: 'mm2', dimension: 'area', factor: 1 },
+  { id: 'cm2', symbol: 'cm2', dimension: 'area', factor: 100 },
+  { id: 'm2', symbol: 'm2', dimension: 'area', factor: 1_000_000 },
+  { id: 'mm3', symbol: 'mm3', dimension: 'volume', factor: 1 },
+  { id: 'cm3', symbol: 'cm3', dimension: 'volume', factor: 1_000 },
+  { id: 'm3', symbol: 'm3', dimension: 'volume', factor: 1_000_000_000 },
   { id: 'deg', symbol: 'deg', dimension: 'angle', factor: 1 },
   { id: 'rad', symbol: 'rad', dimension: 'angle', factor: 180 / Math.PI },
   { id: '%', symbol: '%', dimension: 'percent', factor: 1 },
@@ -63,7 +69,7 @@ const tokenize = (source: string): Token[] => {
   while (index < source.length) {
     const character = source[index]
     if (/\s/.test(character)) { index += 1; continue }
-    if ('+-*/()'.includes(character)) { tokens.push({ kind: 'operator', text: character, position: index }); index += 1; continue }
+    if ('+-*/^(),'.includes(character)) { tokens.push({ kind: 'operator', text: character, position: index }); index += 1; continue }
     if (character === '%') { tokens.push({ kind: 'identifier', text: character, position: index }); index += 1; continue }
     const number = source.slice(index).match(/^(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?/)
     if (number) { tokens.push({ kind: 'number', text: number[0], position: index }); index += number[0].length; continue }
@@ -95,6 +101,46 @@ const divide = (left: Quantity, right: Quantity): Quantity => {
   throw new TypeError(`Cannot divide ${left.dimension} by ${right.dimension}.`)
 }
 
+const power = (base: Quantity, exponent: Quantity): Quantity => {
+  if (exponent.dimension !== 'dimensionless' || !Number.isInteger(exponent.value)) throw new TypeError('Exponent must be a dimensionless integer.')
+  if (base.dimension === 'dimensionless') return { value: Math.pow(base.value, exponent.value), dimension: 'dimensionless' }
+  if (exponent.value === 1) return { ...base }
+  if (exponent.value === 2 && base.dimension === 'length') return { value: base.value ** 2, dimension: 'area' }
+  if (exponent.value === 3 && base.dimension === 'length') return { value: base.value ** 3, dimension: 'volume' }
+  throw new TypeError(`Cannot raise ${base.dimension} to the power ${exponent.value}.`)
+}
+
+const evaluateFunction = (name: string, args: Quantity[]): Quantity => {
+  const normalized = name.toLowerCase()
+  if (normalized === 'abs' || normalized === 'round') {
+    if (args.length !== 1) throw new TypeError(`${name} requires one argument.`)
+    return { value: normalized === 'abs' ? Math.abs(args[0].value) : Math.round(args[0].value), dimension: args[0].dimension }
+  }
+  if (normalized === 'sin' || normalized === 'cos' || normalized === 'tan') {
+    if (args.length !== 1 || (args[0].dimension !== 'angle' && args[0].dimension !== 'dimensionless')) throw new TypeError(`${name} requires an angle or dimensionless argument.`)
+    const radians = args[0].dimension === 'angle' ? args[0].value * Math.PI / 180 : args[0].value
+    return { value: Math[normalized](radians), dimension: 'dimensionless' }
+  }
+  if (normalized === 'atan2') {
+    if (args.length !== 2 || !sameDimension(args[0], args[1])) throw new TypeError('atan2 requires two values with the same dimension.')
+    return { value: Math.atan2(args[0].value, args[1].value) * 180 / Math.PI, dimension: 'angle' }
+  }
+  if (normalized === 'min' || normalized === 'max') {
+    if (args.length < 1 || args.some((argument) => !sameDimension(argument, args[0]))) throw new TypeError(`${name} requires at least one set of same-dimension values.`)
+    const values = args.map((argument) => argument.value)
+    return { value: normalized === 'min' ? Math.min(...values) : Math.max(...values), dimension: args[0].dimension }
+  }
+  if (normalized === 'clamp') {
+    if (args.length !== 3 || !sameDimension(args[0], args[1]) || !sameDimension(args[0], args[2])) throw new TypeError('clamp requires three values with the same dimension.')
+    return { value: Math.min(Math.max(args[0].value, args[1].value), args[2].value), dimension: args[0].dimension }
+  }
+  if (normalized === 'pow') {
+    if (args.length !== 2 || args[0].dimension !== 'dimensionless' || args[1].dimension !== 'dimensionless') throw new TypeError('pow requires two dimensionless values.')
+    return { value: Math.pow(args[0].value, args[1].value), dimension: 'dimensionless' }
+  }
+  throw new ReferenceError(`Unknown expression function: ${name}.`)
+}
+
 class QuantityParser {
   private index = 0
   readonly references = new Set<string>()
@@ -139,7 +185,13 @@ class QuantityParser {
   private parseUnary(): Quantity {
     if (this.match('+')) return this.parseUnary()
     if (this.match('-')) { const value = this.parseUnary(); return { ...value, value: -value.value } }
-    return this.parsePrimary()
+    return this.parsePower()
+  }
+
+  private parsePower(): Quantity {
+    const base = this.parsePrimary()
+    if (!this.match('^')) return base
+    return power(base, this.parseUnary())
   }
 
   private parsePrimary(): Quantity {
@@ -157,6 +209,14 @@ class QuantityParser {
     }
     if (token.kind === 'identifier') {
       if (token.text.toLowerCase() === 'pi') return quantityFromNumber(Math.PI)
+      if (this.match('(')) {
+        const args: Quantity[] = []
+        if (!this.match(')')) {
+          do args.push(this.parseAddSub()); while (this.match(','))
+          if (!this.match(')')) throw new SyntaxError(`Missing ')' at position ${this.peek().position}.`)
+        }
+        return evaluateFunction(token.text, args)
+      }
       const value = this.variables.get(token.text)
       if (!value) throw new ReferenceError(`Unknown expression reference: ${token.text}.`)
       this.references.add(token.text)

src/styles.css

@@ -166,9 +166,10 @@ button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px s
 .toolbar-select select { appearance: none; border: 1px solid var(--line); background: var(--bg-raised); color: var(--text-soft); border-radius: 4px; height: 36px; padding: 0 28px 0 9px; }
 .toolbar-select svg { margin-left: -24px; pointer-events: none; }
 .project-list { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg-panel); }
-.project-list-row { min-height: 72px; display: grid; grid-template-columns: 58px minmax(180px, 1fr) 100px 105px 95px 32px; gap: 14px; align-items: center; padding: 7px 14px 7px 8px; border-bottom: 1px solid var(--line-soft); }
+.project-list-row { width: 100%; min-height: 72px; display: grid; grid-template-columns: 58px minmax(180px, 1fr) 100px 105px 95px 32px; gap: 14px; align-items: center; padding: 7px 14px 7px 8px; border: 0; border-bottom: 1px solid var(--line-soft); background: transparent; color: inherit; text-align: left; cursor: pointer; }
 .project-list-row:last-child { border-bottom: 0; }
 .project-list-row:hover { background: var(--bg-hover); }
+.project-list-empty { min-height: 112px; display: grid; place-items: center; color: var(--text-muted); font-size: 12px; }
 .list-thumbnail { width: 58px; height: 56px; border-radius: 3px; }
 .list-thumbnail .preview-shape { width: 42px; height: 28px; }
 .list-main strong, .list-main span { display: block; }

tests/facade.test.ts

@@ -1,14 +1,43 @@
 import { test } from 'node:test'
 import assert from 'node:assert/strict'
+import { strToU8, zipSync } from 'fflate'
 import { createMockFacade } from '../src/facade/mockFacade'
 import { PROJECT_SCHEMA_MIGRATIONS, PROJECT_SCHEMA_SQL, PROJECT_SCHEMA_VERSION } from '../src/facade/projectSchema'
-import { PersistenceWriteQueue, ProjectAutosaveScheduler } from '../src/facade/projectStore'
+import { createSqliteProjectPersistence, PersistenceWriteQueue, ProjectAutosaveScheduler } from '../src/facade/projectStore'
 import { DependencyGraph } from '../src/facade/dependencyGraph'
 import { evaluateQuantityExpression, quantityFromNumber } from '../src/facade/units'
-import { createSubshapeRefs, matchSubshapes, signatureForFace } from '../src/facade/topologyNaming'
+import { createEdgeSubshapeRefs, createSubshapeRefs, createVertexSubshapeRefs, matchSubshapes, signatureForEdge, signatureForFace, signatureForVertex } from '../src/facade/topologyNaming'
 import { createSketch, solveSketch } from '../src/facade/sketcher'
+import { createFacadeGeometryRecomputeExecutor, executeFacadeRecomputeNode, RecomputeCoordinator, type RecomputeGeometryRuntime } from '../src/facade/recomputeEngine'
+import { inspectFcstdArchive } from '../src/facade/fcstd'
 import { assertShapeHandleIntegrity, normalizeBitbybitMesh, validateBooleanUnionInput, validateBoxInput, validateChamferInput, validateConeInput, validateCylinderInput, validateFilletInput, validatePadInput, validatePlacementInput, validatePlanarProfile, validateRevolutionInput, validateSphereInput } from '../src/facade/geometryRuntime'
-import type { ShapeHandle } from '../src/facade/types'
+import type { DocumentSnapshot, ShapeHandle } from '../src/facade/types'
+
+const recomputeDocumentFixture = (edges: DocumentSnapshot['dependencies'] = []): DocumentSnapshot => ({
+  id: 'doc-recompute',
+  label: 'Recompute fixture',
+  version: 1,
+  dirty: true,
+  readOnly: false,
+  units: 'mm',
+  tree: [
+    { id: 'root', label: 'Root', type: 'feature', state: 'dirty' },
+    { id: 'child', label: 'Child', type: 'feature', state: 'dirty' },
+  ],
+  objects: [
+    { id: 'root', typeId: 'Part::Feature', properties: [] },
+    { id: 'child', typeId: 'Part::Feature', properties: [] },
+  ],
+  dependencies: edges,
+  recompute: {
+    generation: 0,
+    status: 'idle',
+    objectStates: { root: 'touched', child: 'touched' },
+    dirtyObjects: ['root'],
+    order: [],
+    errors: [],
+  },
+})
 
 test('facade exposes a stable initial document projection', () => {
   const facade = createMockFacade()
@@ -96,6 +125,17 @@ test('quantity expressions convert units and reject incompatible dimensions', ()
   assert.equal(evaluateQuantityExpression('2 + 3').value.value, 5)
   assert.equal(quantityFromNumber(7).dimension, 'dimensionless')
   assert.equal(evaluateQuantityExpression('50%').value.dimension, 'percent')
+  assert.ok(Math.abs(evaluateQuantityExpression('sin(90 deg)').value.value - 1) < 1e-12)
+  assert.equal(evaluateQuantityExpression('max(2 mm, 1 cm)').value.value, 10)
+  assert.equal(evaluateQuantityExpression('clamp(15, 0, 10)').value.value, 10)
+  assert.equal(evaluateQuantityExpression('round(2.6)').value.value, 3)
+  assert.equal(evaluateQuantityExpression('2 mm ^ 2').value.dimension, 'area')
+  assert.equal(evaluateQuantityExpression('2 mm ^ 3').value.dimension, 'volume')
+  assert.equal(evaluateQuantityExpression('1 cm2 + 100 mm2').value.value, 200)
+  assert.equal(evaluateQuantityExpression('2 ^ 3').value.value, 8)
+  assert.throws(() => evaluateQuantityExpression('sin(2 mm)'), /angle or dimensionless/)
+  assert.throws(() => evaluateQuantityExpression('unknown(1)'), /Unknown expression function/)
+  assert.throws(() => evaluateQuantityExpression('2 mm ^ 0.5'), /dimensionless integer/)
 })
 
 test('topology signatures are independent of transient face indexes and flag ambiguity', () => {
@@ -111,6 +151,21 @@ test('topology signatures are independent of transient face indexes and flag amb
   const matches = matchSubshapes([{ ref: first.refs[0], signature: first.signatures[0] }], [{ ref: duplicate.refs[0], signature: duplicate.signatures[0] }])
   assert.equal(matches[0].status, 'stable')
   assert.equal(matches[0].previousId, first.refs[0].persistentId)
+  const deleted = matchSubshapes([{ ref: first.refs[0], signature: first.signatures[0] }, { ref: duplicate.refs[1], signature: duplicate.signatures[1] }], [{ ref: duplicate.refs[0], signature: duplicate.signatures[0] }])
+  assert.equal(deleted.at(-1)?.status, 'deleted')
+})
+
+test('edge and vertex topology signatures are orientation/index independent', () => {
+  const edge = signatureForEdge([0, 0, 0], [2, 0, 0])
+  assert.equal(edge.hash, signatureForEdge([2, 0, 0], [0, 0, 0]).hash)
+  assert.equal(signatureForVertex([1, 2, 3]).hash, signatureForVertex([1.000001, 2, 3], 1e-5).hash)
+  const face = { vertexCoord: [0, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 2], normalCoord: [], triIndexes: [0, 1, 2, 0, 2, 3] }
+  const edges = createEdgeSubshapeRefs('shape-topology', 3, [face])
+  const vertices = createVertexSubshapeRefs('shape-topology', 3, [face])
+  assert.equal(edges.refs.length, 5)
+  assert.equal(vertices.refs.length, 4)
+  assert.ok(edges.refs.every((ref) => ref.kind === 'edge' && ref.persistentId.startsWith('topo-edge-')))
+  assert.ok(vertices.refs.every((ref) => ref.kind === 'vertex' && ref.persistentId.startsWith('topo-vertex-')))
 })
 
 test('basic sketch solver applies geometric constraints and reports remaining degrees of freedom', () => {
@@ -132,6 +187,24 @@ test('basic sketch solver applies geometric constraints and reports remaining de
   assert.ok(conflict.diagnostics.some((diagnostic) => diagnostic.code === 'SOLVER_NOT_CONVERGED'))
 })
 
+test('Sketcher solver supports diameter, symmetric and tangent constraints at the model boundary', () => {
+  const sketch = createSketch('advanced-constraints', [
+    { id: 'circle-1', type: 'circle', center: { x: 0, y: 1 }, radius: 1 },
+    { id: 'line-1', type: 'line', start: { x: -5, y: 0 }, end: { x: 5, y: 0 } },
+    { id: 'point-a', type: 'point', position: { x: -2, y: 2 } },
+    { id: 'point-b', type: 'point', position: { x: 4, y: 0 } },
+    { id: 'center', type: 'point', position: { x: 1, y: 1 } },
+  ], [
+    { id: 'diameter-1', type: 'diameter', geometryId: 'circle-1', value: 4 },
+    { id: 'tangent-1', type: 'tangent', firstGeometryId: 'line-1', secondGeometryId: 'circle-1' },
+    { id: 'symmetric-1', type: 'symmetric', first: { geometryId: 'point-a', point: 'position' }, second: { geometryId: 'point-b', point: 'position' }, center: { geometryId: 'center', point: 'position' } },
+  ])
+  const result = solveSketch(sketch)
+  assert.ok(result.residual <= 1e-7)
+  assert.equal((result.snapshot.geometry.find((geometry) => geometry.id === 'circle-1') as Extract<typeof result.snapshot.geometry[number], { type: 'circle' }>).radius, 2)
+  assert.equal((result.snapshot.geometry.find((geometry) => geometry.id === 'circle-1') as Extract<typeof result.snapshot.geometry[number], { type: 'circle' }>).center.y, 2)
+})
+
 test('sketcher operations are facade transactions and survive the project fallback store', async () => {
   const facade = createMockFacade()
   const before = facade.app.document.getActive().version
@@ -156,6 +229,9 @@ test('Sketcher solve command is selection-aware and emits the standard command l
   facade.gui.command.execute({ commandId: 'solve-sketch' })
   assert.deepEqual(events, ['command.started', 'command.completed'])
   assert.equal(facade.app.document.getObject('sketch')?.sketch?.solver.status, 'solved')
+  facade.selection.select('pad')
+  assert.equal(facade.gui.command.getState('solve-sketch').status, 'disabled')
+  assert.match(facade.gui.command.getState('solve-sketch').reason || '', /Sketcher sketch/)
   facade.selection.clear()
   assert.equal(facade.gui.command.getState('solve-sketch').status, 'disabled')
 })
@@ -169,9 +245,281 @@ test('dependency graph propagates dirty state and orders dependencies', () => {
   const plan = graph.plan(['pad'])
   assert.deepEqual(plan.cycles, [])
   assert.deepEqual(plan.order, ['pad', 'pocket', 'fillet', 'body'])
+  assert.deepEqual(plan.levels, [['pad'], ['pocket'], ['fillet'], ['body']])
   assert.deepEqual(plan.affected, ['pad', 'pocket', 'fillet', 'body'])
   graph.addEdge({ sourceId: 'pad', targetId: 'body', relation: 'expression' })
   assert.deepEqual(graph.findCycles(new Set(['pad', 'pocket', 'fillet', 'body'])), [['pad', 'pocket', 'fillet', 'body']])
+  const branched = new DependencyGraph([{ sourceId: 'left', targetId: 'root', relation: 'link' }, { sourceId: 'right', targetId: 'root', relation: 'link' }], ['root', 'left', 'right'])
+  assert.deepEqual(branched.plan(['root']).levels, [['root'], ['left', 'right']])
+})
+
+test('generation-aware recompute cancels an older run before accepting its result', async () => {
+  let version = 1
+  const coordinator = new RecomputeCoordinator(async (object, _document, context) => {
+    if (context.generation === 1) {
+      await new Promise<void>((resolve, reject) => {
+        const timer = setTimeout(resolve, 30)
+        context.signal.addEventListener('abort', () => {
+          clearTimeout(timer)
+          const error = new Error('cancelled')
+          error.name = 'AbortError'
+          reject(error)
+        }, { once: true })
+      })
+    }
+    return { status: 'success', updatedObject: object }
+  }, () => version)
+  const document = recomputeDocumentFixture()
+  const first = coordinator.run(document)
+  const second = coordinator.run(document)
+  assert.equal((await first).status, 'cancelled')
+  const accepted = await second
+  assert.equal(accepted.status, 'completed')
+  assert.equal(accepted.generation, 2)
+  assert.deepEqual(accepted.completed, ['root'])
+  version = 2
+})
+
+test('recompute executes independent dependency levels concurrently and merges in stable order', async () => {
+  const document: DocumentSnapshot = {
+    ...recomputeDocumentFixture(),
+    tree: [
+      { id: 'root', label: 'Root', type: 'feature', state: 'dirty' },
+      { id: 'left', label: 'Left', type: 'feature', state: 'dirty' },
+      { id: 'right', label: 'Right', type: 'feature', state: 'dirty' },
+    ],
+    objects: [
+      { id: 'root', typeId: 'Part::Feature', properties: [] },
+      { id: 'left', typeId: 'Part::Feature', properties: [] },
+      { id: 'right', typeId: 'Part::Feature', properties: [] },
+    ],
+    dependencies: [
+      { sourceId: 'left', targetId: 'root', relation: 'link' },
+      { sourceId: 'right', targetId: 'root', relation: 'link' },
+    ],
+    recompute: {
+      generation: 0,
+      status: 'idle',
+      objectStates: { root: 'touched', left: 'touched', right: 'touched' },
+      dirtyObjects: ['root'],
+      order: [],
+      errors: [],
+    },
+  }
+  let active = 0
+  let maximumActive = 0
+  const coordinator = new RecomputeCoordinator(async (object) => {
+    active += 1
+    maximumActive = Math.max(maximumActive, active)
+    await new Promise((resolve) => setTimeout(resolve, 5))
+    active -= 1
+    return { status: 'success', updatedObject: object }
+  }, () => 1)
+
+  const result = await coordinator.run(document)
+  assert.equal(result.status, 'completed')
+  assert.equal(maximumActive, 2)
+  assert.deepEqual(result.order, ['root', 'left', 'right'])
+  assert.deepEqual(result.completed, ['root', 'left', 'right'])
+  assert.deepEqual(result.levels, [['root'], ['left', 'right']])
+})
+
+test('recompute rejects results from an obsolete document version', async () => {
+  let version = 1
+  const coordinator = new RecomputeCoordinator(async () => {
+    version = 2
+    return { status: 'success' }
+  }, () => version)
+  const result = await coordinator.run(recomputeDocumentFixture())
+  assert.equal(result.status, 'stale')
+  assert.deepEqual(result.dirtyObjects, ['root'])
+})
+
+test('recompute failure marks dependent objects as upstream-failed', async () => {
+  const document = recomputeDocumentFixture([{ sourceId: 'child', targetId: 'root', relation: 'link' }])
+  const coordinator = new RecomputeCoordinator(async (object) => object.id === 'root'
+    ? { status: 'failed', errors: [{ objectId: object.id, code: 'TEST_FAILURE', message: 'expected failure' }] }
+    : { status: 'success' }, () => 1)
+  const result = await coordinator.run(document)
+  assert.equal(result.status, 'failed')
+  assert.deepEqual(result.failed, ['root'])
+  assert.deepEqual(result.skipped, ['child'])
+  assert.equal(result.objectStates.child, 'upstream-failed')
+  assert.ok(result.errors.some((error) => error.code === 'UPSTREAM_FAILED'))
+})
+
+test('recompute suppression skips dependent nodes without reporting a failure', async () => {
+  const document = recomputeDocumentFixture([{ sourceId: 'child', targetId: 'root', relation: 'link' }])
+  document.objects[0].properties.push({ name: 'Suppressed', label: 'Suppressed', group: 'Feature state', scope: 'data', type: 'App::PropertyBool', value: true, recompute: true })
+  const executed: string[] = []
+  const coordinator = new RecomputeCoordinator(async (object, source, context) => {
+    executed.push(object.id)
+    return executeFacadeRecomputeNode(object, source, context)
+  }, () => 1)
+  const result = await coordinator.run(document)
+  assert.equal(result.status, 'completed')
+  assert.deepEqual(executed, ['root'])
+  assert.deepEqual(result.suppressed, ['root'])
+  assert.deepEqual(result.skipped, ['root', 'child'])
+  assert.equal(result.objectStates.root, 'suppressed')
+  assert.equal(result.objectStates.child, 'upstream-suppressed')
+  assert.deepEqual(result.dirtyObjects, [])
+  assert.deepEqual(result.errors, [])
+})
+
+test('OCCT feature executor builds a Sketch to Pad to Pocket chain and retains the last valid Shape', async () => {
+  const shape = (id: string): ShapeHandle => ({ id, kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc-feature', documentVersion: 2 })
+  const calls: string[] = []
+  let padShouldFail = false
+  const runtime: RecomputeGeometryRuntime = {
+    capabilities: () => ({ status: 'ready' }),
+    createBox: async () => shape('box-shape'),
+    createCylinder: async () => shape('cylinder-shape'),
+    createSphere: async () => shape('sphere-shape'),
+    createCone: async () => shape('cone-shape'),
+    union: async () => shape('union-shape'),
+    cut: async () => shape('cut-shape'),
+    intersection: async () => shape('intersection-shape'),
+    pad: async (input) => { calls.push(`pad:${input.profile.outer.length}`); if (padShouldFail) throw new Error('OCCT pad failed'); return shape('pad-shape') },
+    pocket: async (input) => { calls.push(`pocket:${input.base.id}:${String(input.throughAll)}`); return shape('pocket-shape') },
+    revolution: async (input) => { calls.push(`revolution:${input.angle}:${input.axisDirection?.[1]}`); return shape('revolution-shape') },
+    fillet: async () => shape('fillet-shape'),
+    chamfer: async () => shape('chamfer-shape'),
+    release: async (released) => { calls.push(`release:${released.id}`) },
+  }
+  const sketch = { id: 'sketch', typeId: 'Sketcher::SketchObject', properties: [], sketch: createSketch('sketch', [
+    { id: 'a', type: 'line' as const, start: { x: -1, y: -1 }, end: { x: 1, y: -1 } },
+    { id: 'b', type: 'line' as const, start: { x: 1, y: -1 }, end: { x: 1, y: 1 } },
+    { id: 'c', type: 'line' as const, start: { x: 1, y: 1 }, end: { x: -1, y: 1 } },
+    { id: 'd', type: 'line' as const, start: { x: -1, y: 1 }, end: { x: -1, y: -1 } },
+  ]) }
+  const pad = { id: 'pad', typeId: 'PartDesign::Pad', properties: [
+    { name: 'Length', label: 'Length', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLength' as const, value: 10, unit: 'mm' },
+    { name: 'Profile', label: 'Profile', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLink' as const, value: 'sketch' },
+  ] }
+  const pocket = { id: 'pocket', typeId: 'PartDesign::Pocket', properties: [
+    { name: 'Type', label: 'Type', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyEnumeration' as const, value: 'Through all', options: ['Dimension', 'Through all', 'Up to face'] },
+    { name: 'Length', label: 'Length', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLength' as const, value: 5, unit: 'mm' },
+    { name: 'Profile', label: 'Profile', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLink' as const, value: 'sketch' },
+    { name: 'Base', label: 'Base', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLink' as const, value: 'pad' },
+  ] }
+  const document: DocumentSnapshot = { ...recomputeDocumentFixture(), version: 2, objects: [sketch, pad, pocket], dependencies: [
+    { sourceId: 'pad', targetId: 'sketch', relation: 'link' },
+    { sourceId: 'pocket', targetId: 'pad', relation: 'link' },
+    { sourceId: 'pocket', targetId: 'sketch', relation: 'link' },
+  ], recompute: { generation: 0, status: 'idle', objectStates: { sketch: 'touched', pad: 'touched', pocket: 'touched' }, dirtyObjects: ['sketch'], order: [], errors: [] } }
+  const shapes = new Map<string, ShapeHandle>()
+  const executor = createFacadeGeometryRecomputeExecutor(runtime, shapes)
+  const context = { documentId: document.id, documentVersion: document.version, generation: 1, signal: new AbortController().signal }
+  const result = await new RecomputeCoordinator(executor, () => 2).run(document)
+  assert.equal(result.status, 'completed')
+  assert.deepEqual(calls.slice(0, 2), ['pad:3', 'pocket:pad-shape:true'])
+  assert.equal(shapes.get('pad')?.id, 'pad-shape')
+  assert.equal(shapes.get('pocket')?.id, 'pocket-shape')
+
+  padShouldFail = true
+  const failed = await executor(pad, document, context)
+  assert.equal(failed.status, 'failed')
+  assert.equal(failed.errors?.[0].code, 'GEOMETRY_EXECUTION_FAILED')
+  assert.equal(shapes.get('pad')?.id, 'pad-shape')
+  const upToFace = { ...pocket, properties: pocket.properties.map((property) => property.name === 'Type' ? { ...property, value: 'Up to face' } : property) }
+  const unsupported = await executor(upToFace, document, context)
+  assert.equal(unsupported.status, 'failed')
+  assert.equal(unsupported.errors?.[0].code, 'UP_TO_FACE_UNSUPPORTED')
+
+  const revolution = { id: 'revolution', typeId: 'PartDesign::Revolution', properties: [
+    { name: 'Angle', label: 'Angle', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyAngle' as const, value: 270, unit: 'deg' },
+    { name: 'Profile', label: 'Profile', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyLink' as const, value: 'sketch' },
+    { name: 'Reversed', label: 'Reversed', group: 'Parameters', scope: 'data' as const, type: 'App::PropertyBool' as const, value: true },
+  ] }
+  const revolutionResult = await executor(revolution, document, context)
+  assert.equal(revolutionResult.status, 'success')
+  assert.equal(shapes.get('revolution')?.id, 'revolution-shape')
+  assert.ok(calls.includes('revolution:270:-1'))
+
+  const suppressedPad = { ...pad, properties: [...pad.properties, { name: 'Suppressed', label: 'Suppressed', group: 'Feature state', scope: 'data' as const, type: 'App::PropertyBool' as const, value: true }] }
+  const suppressedResult = await executor(suppressedPad, document, context)
+  assert.equal(suppressedResult.status, 'suppressed')
+  assert.equal(shapes.has('pad'), false)
+  assert.ok(calls.includes('release:pad-shape'))
+})
+
+test('Part primitive and boolean nodes execute through the same Shape cache', async () => {
+  const shape = (id: string): ShapeHandle => ({ id, kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc-part', documentVersion: 2 })
+  const calls: string[] = []
+  const runtime: RecomputeGeometryRuntime = {
+    capabilities: () => ({ status: 'ready' }),
+    createBox: async (input) => { calls.push(`box:${input.width}:${input.length}:${input.height}`); return shape('box-shape') },
+    createCylinder: async () => shape('cylinder-shape'),
+    createSphere: async () => shape('sphere-shape'),
+    createCone: async () => shape('cone-shape'),
+    union: async (input) => { calls.push(`union:${input.shapes.map((entry) => entry.id).join(',')}`); return shape('fuse-shape') },
+    cut: async () => shape('cut-shape'),
+    intersection: async () => shape('common-shape'),
+    pad: async () => shape('pad-shape'),
+    pocket: async () => shape('pocket-shape'),
+    revolution: async () => shape('revolution-shape'),
+    fillet: async () => shape('fillet-shape'),
+    chamfer: async () => shape('chamfer-shape'),
+    release: async () => undefined,
+  }
+  const boxProperties = (width: number) => [
+    { name: 'Width', label: 'Width', group: 'Box', scope: 'data' as const, type: 'App::PropertyLength' as const, value: width },
+    { name: 'Length', label: 'Length', group: 'Box', scope: 'data' as const, type: 'App::PropertyLength' as const, value: 4 },
+    { name: 'Height', label: 'Height', group: 'Box', scope: 'data' as const, type: 'App::PropertyLength' as const, value: 5 },
+  ]
+  const document: DocumentSnapshot = {
+    id: 'doc-part', label: 'Part fixture', version: 2, dirty: true, readOnly: false, units: 'mm',
+    tree: [{ id: 'boxA', label: 'Box', type: 'feature', state: 'dirty' }, { id: 'boxB', label: 'Box001', type: 'feature', state: 'dirty' }, { id: 'fuse', label: 'Union', type: 'feature', state: 'dirty' }],
+    objects: [
+      { id: 'boxA', typeId: 'Part::Box', properties: boxProperties(2) },
+      { id: 'boxB', typeId: 'Part::Box', properties: boxProperties(3) },
+      { id: 'fuse', typeId: 'Part::Fuse', properties: [
+        { name: 'Base', label: 'Base', group: 'Boolean', scope: 'data', type: 'App::PropertyLink' as const, value: 'boxA' },
+        { name: 'Tool', label: 'Tool', group: 'Boolean', scope: 'data', type: 'App::PropertyLink' as const, value: 'boxB' },
+      ] },
+    ],
+    dependencies: [{ sourceId: 'fuse', targetId: 'boxA', relation: 'link' }, { sourceId: 'fuse', targetId: 'boxB', relation: 'link' }],
+    recompute: { generation: 0, status: 'idle', objectStates: { boxA: 'touched', boxB: 'touched', fuse: 'touched' }, dirtyObjects: ['boxA', 'boxB'], order: [], errors: [] },
+  }
+  const shapes = new Map<string, ShapeHandle>()
+  const result = await new RecomputeCoordinator(createFacadeGeometryRecomputeExecutor(runtime, shapes), () => 2).run(document)
+  assert.equal(result.status, 'completed')
+  assert.equal(shapes.get('boxA')?.id, 'box-shape')
+  assert.equal(shapes.get('fuse')?.id, 'fuse-shape')
+  assert.ok(calls.includes('box:2:4:5'))
+  assert.ok(calls.includes('union:box-shape,box-shape'))
+})
+
+test('facade async recompute commits only an accepted generation', async () => {
+  const facade = createMockFacade()
+  facade.app.document.setProperty({ objectId: 'pad', propertyName: 'Length', value: 51 })
+  const result = await facade.app.document.recomputeAsync()
+  assert.equal(result.status, 'completed')
+  assert.equal(facade.app.document.getActive().recompute?.generation, result.generation)
+  assert.equal(facade.app.document.getActive().recompute?.dirtyObjects.length, 0)
+})
+
+test('feature suppression persists and unsuppress recomputes only its dependent closure', async () => {
+  const facade = createMockFacade()
+  facade.app.document.setProperty({ objectId: 'pocket', propertyName: 'Suppressed', value: true })
+  const suppressed = facade.app.document.recompute()
+  assert.equal(suppressed.status, 'completed')
+  assert.deepEqual(suppressed.order, ['pocket', 'fillet', 'body'])
+  assert.deepEqual(new Set(suppressed.affected), new Set(['pocket', 'fillet', 'body']))
+  assert.equal(facade.app.document.getActive().recompute?.objectStates.pocket, 'suppressed')
+  assert.equal(facade.app.document.getActive().recompute?.objectStates.fillet, 'upstream-suppressed')
+
+  await facade.project.save()
+  assert.equal((await facade.project.load('doc-pump-housing'))?.objects.find((object) => object.id === 'pocket')?.properties.find((property) => property.name === 'Suppressed')?.value, true)
+
+  facade.app.document.setProperty({ objectId: 'pocket', propertyName: 'Suppressed', value: false })
+  const restored = await facade.app.document.recomputeAsync()
+  assert.equal(restored.status, 'completed')
+  assert.deepEqual(restored.order, ['pocket', 'fillet', 'body'])
+  assert.deepEqual(new Set(restored.affected), new Set(['pocket', 'fillet', 'body']))
+  assert.equal(facade.app.document.getActive().recompute?.objectStates.pocket, 'up-to-date')
+  assert.equal(facade.app.document.getActive().recompute?.objectStates.fillet, 'up-to-date')
 })
 
 test('persistence writes are serialized and continue after a failed write', async () => {
@@ -196,6 +544,27 @@ test('persistence writes are serialized and continue after a failed write', asyn
   assert.equal(results[2].status, 'fulfilled')
 })
 
+test('project persistence broadcasts saved document versions across clients', async () => {
+  const writer = createSqliteProjectPersistence()
+  const observer = createSqliteProjectPersistence()
+  const notice = new Promise<{ documentId: string; documentVersion: number }>((resolve, reject) => {
+    const timer = setTimeout(() => reject(new Error('Expected cross-tab save notice.')), 250)
+    const unsubscribe = observer.subscribeExternalChanges((change) => {
+      clearTimeout(timer)
+      unsubscribe()
+      resolve(change)
+    })
+  })
+  const document = recomputeDocumentFixture()
+  const saved = await writer.save(document)
+  assert.equal(writer.capabilities().crossTabWriteLock, 'local-queue')
+  const received = await notice
+  assert.equal(received.documentId, saved.documentId)
+  assert.equal(received.documentVersion, saved.documentVersion)
+  await writer.dispose()
+  await observer.dispose()
+})
+
 test('autosave scheduler coalesces idle document changes and flushes the latest version', async () => {
   const savedVersions: number[] = []
   const scheduler = new ProjectAutosaveScheduler(async (document) => { savedVersions.push(document.version); return { documentId: document.id, documentVersion: document.version, persistedAt: Date.now(), mode: 'sqlite-memory' } }, 5)
@@ -248,6 +617,28 @@ test('disabled commands return a reason instead of mutating the document', () =>
   assert.equal(facade.getState().document.version, before)
 })
 
+test('manifest commands without a Bitbybit executor are explicitly unsupported', () => {
+  const facade = createMockFacade()
+  const before = facade.getState().document.version
+  const state = facade.gui.command.getState('linear-pattern')
+  assert.equal(state.status, 'disabled')
+  assert.match(state.reason || '', /business executor/)
+  facade.gui.command.execute({ commandId: 'linear-pattern' })
+  assert.equal(facade.getState().diagnostics.at(-1)?.code, 'COMMAND_UNIMPLEMENTED')
+  assert.equal(facade.getState().document.version, before)
+})
+
+test('implemented commands enforce their FreeCAD workbench preconditions', () => {
+  const facade = createMockFacade()
+  facade.gui.workbench.setActive('Sketcher')
+  assert.equal(facade.gui.command.getState('create-body').status, 'disabled')
+  assert.match(facade.gui.command.getState('create-body').reason || '', /Part Design/)
+  assert.equal(facade.gui.command.getState('new-sketch').status, 'enabled')
+  facade.gui.workbench.setActive('Part Design')
+  assert.equal(facade.gui.command.getState('new-sketch').status, 'disabled')
+  assert.equal(facade.gui.command.getState('pocket').status, 'enabled')
+})
+
 test('command events carry a document-scoped request context', () => {
   const facade = createMockFacade()
   const events: string[] = []
@@ -328,10 +719,84 @@ test('project persistence remains behind the facade contract', async () => {
   facade.app.document.setProperty({ objectId: 'pad', propertyName: 'Length', value: 55 })
   const saved = await facade.project.save()
   assert.equal(saved.documentId, 'doc-pump-housing')
+  const projects = await facade.project.list()
+  assert.equal(projects.length, 1)
+  const { updatedAt, ...summary } = projects[0]
+  assert.ok(updatedAt > 0)
+  assert.deepEqual(summary, { documentId: 'doc-pump-housing', label: 'Pump Housing', documentVersion: saved.documentVersion, objectCount: 7, dirty: true, readOnly: false })
   const loaded = await facade.project.load('doc-pump-housing')
   assert.equal(loaded?.label, 'Pump Housing')
   assert.equal(loaded?.objects.find((object) => object.id === 'pad')?.properties.find((property) => property.name === 'Length')?.value, 55)
+  facade.app.document.setProperty({ objectId: 'pad', propertyName: 'Length', value: 61 })
+  const restored = await facade.app.document.load('doc-pump-housing')
+  assert.equal(restored?.objects.find((object) => object.id === 'pad')?.properties.find((property) => property.name === 'Length')?.value, 55)
+  assert.equal(restored?.recompute?.status, 'completed')
+  assert.equal(facade.selection.getObjectId(), '')
+  assert.equal(facade.task.getActive(), null)
   assert.equal(facade.project.capabilities().mode, 'sqlite-memory')
+  const recovery = await facade.project.recovery('doc-pump-housing')
+  assert.equal(recovery.integrity, 'ok')
+  assert.equal(recovery.lastSavedVersion, loaded?.version)
+})
+
+test('recovery report identifies missing snapshots in the transient fallback store', async () => {
+  const facade = createMockFacade()
+  const recovery = await facade.project.recovery('missing-document')
+  assert.equal(recovery.integrity, 'unavailable')
+  assert.equal(recovery.lastSavedVersion, null)
+  assert.ok(recovery.warnings.some((warning) => /No saved snapshot/.test(warning)))
+})
+
+test('FCStd inspection reports recognized, proxy, and Python-backed objects without executing code', () => {
+  const documentXml = `<?xml version="1.0" encoding="UTF-8"?>
+<Document SchemaVersion="4">
+  <Properties Count="1"><Property name="Label" type="App::PropertyString"><String value="Imported assembly"/></Property></Properties>
+  <Objects Count="3">
+    <Object type="PartDesign::Body" name="Body"/>
+    <Object type="Vendor::CustomFeature" name="Custom"/>
+    <Object type="Part::FeaturePython" name="Scripted"/>
+  </Objects>
+  <ObjectData Count="3">
+    <Object name="Body"><Properties Count="1"><Property name="Label" type="App::PropertyString"><String value="Main body"/></Property></Properties></Object>
+    <Object name="Custom"><Properties Count="0"/></Object>
+    <Object name="Scripted"><Properties Count="0"/></Object>
+  </ObjectData>
+</Document>`
+  const archive = zipSync({
+    'Document.xml': strToU8(documentXml),
+    'GuiDocument.xml': strToU8('<GuiDocument/>'),
+    'Macro/unsafe.py': strToU8('raise RuntimeError("must not run")'),
+  })
+  const inspection = inspectFcstdArchive(archive)
+  assert.equal(inspection.label, 'Imported assembly')
+  assert.equal(inspection.schemaVersion, '4')
+  assert.equal(inspection.objects.find((object) => object.name === 'Body')?.label, 'Main body')
+  assert.equal(inspection.compatibility.recognizedObjects, 1)
+  assert.equal(inspection.compatibility.proxyObjects, 1)
+  assert.equal(inspection.compatibility.blockedObjects, 1)
+  assert.equal(inspection.compatibility.level, 'blocked')
+  assert.equal(inspection.compatibility.codeExecutionBlocked, true)
+  assert.deepEqual(inspection.compatibility.unknownTypeIds, ['Vendor::CustomFeature'])
+  assert.ok(inspection.entries.some((entry) => entry.role === 'script'))
+  assert.equal(inspection.proxyDocument.readOnly, true)
+  assert.equal(inspection.proxyDocument.objects.length, 3)
+  assert.equal(inspection.proxyDocument.objects[1].properties.find((property) => property.name === 'ImportSupport')?.value, 'proxy')
+})
+
+test('FCStd inspection rejects missing metadata, traversal paths, and suspicious compression ratios', () => {
+  assert.throws(() => inspectFcstdArchive(zipSync({ 'GuiDocument.xml': strToU8('<GuiDocument/>') })), /Document\.xml/)
+  assert.throws(() => inspectFcstdArchive(zipSync({ '../Document.xml': strToU8('<Document/>') })), /Unsafe FCStd entry path/)
+  const compressed = zipSync({ 'Document.xml': strToU8(`<Document>${' '.repeat(20_000)}</Document>`) })
+  assert.throws(() => inspectFcstdArchive(compressed, { maxCompressionRatio: 2 }), /compression ratio/)
+})
+
+test('FCStd inspection is available only through the facade project boundary', () => {
+  const facade = createMockFacade()
+  const archive = zipSync({ 'Document.xml': strToU8('<Document SchemaVersion="4"><Objects Count="0"/><ObjectData Count="0"/></Document>') })
+  const inspection = facade.project.fcstd.inspect(archive)
+  assert.equal(inspection.format, 'FCStd')
+  assert.equal(inspection.compatibility.level, 'metadata-compatible')
+  assert.equal(inspection.compatibility.readOnly, true)
 })
 
 test('project resources use content identity and reference counting', async () => {
@@ -354,7 +819,7 @@ test('Part Design feature tasks commit a document object and remain undoable', (
   const before = facade.app.document.getActive()
   facade.gui.command.execute({ commandId: 'pad' })
   assert.equal(facade.task.getActive()?.commandId, 'pad')
-  facade.task.update({ length: 42, reversed: false })
+  facade.task.update({ length: 55, reversed: true, midplane: true })
   facade.task.apply()
 
   const committed = facade.app.document.getActive()
@@ -363,9 +828,57 @@ test('Part Design feature tasks commit a document object and remain undoable', (
   assert.equal(committed.version, before.version + 1)
   assert.equal(facade.selection.getObjectId(), 'pad001')
   assert.equal(committed.dirty, true)
+  assert.equal(committed.objects.find((object) => object.id === 'pad001')?.properties.find((property) => property.name === 'Length')?.value, 55)
+  assert.equal(committed.objects.find((object) => object.id === 'pad001')?.properties.find((property) => property.name === 'Reversed')?.value, true)
+  assert.equal(committed.objects.find((object) => object.id === 'pad001')?.properties.find((property) => property.name === 'Midplane')?.value, true)
+  assert.equal(committed.objects.find((object) => object.id === 'body')?.properties.find((property) => property.name === 'Tip')?.value, 'pad001')
+  assert.ok(committed.recompute?.dirtyObjects.includes('pad001'))
 
   facade.history.undo()
   assert.equal(facade.app.document.getActive().tree.some((item) => item.id === 'pad001'), false)
+  assert.equal(facade.app.document.getObject('body')?.properties.find((property) => property.name === 'Tip')?.value, 'fillet')
   facade.history.redo()
   assert.equal(facade.app.document.getActive().tree.some((item) => item.id === 'pad001'), true)
+  assert.equal(facade.app.document.getObject('body')?.properties.find((property) => property.name === 'Tip')?.value, 'pad001')
+
+  facade.gui.command.execute({ commandId: 'revolution' })
+  assert.equal(facade.task.getActive()?.commandId, 'revolution')
+  facade.task.apply()
+  const revolution = facade.app.document.getObject('revolution')
+  assert.equal(revolution?.typeId, 'PartDesign::Revolution')
+  assert.equal(revolution?.properties.find((property) => property.name === 'Angle')?.value, 360)
+  facade.app.document.setProperty({ objectId: 'revolution', propertyName: 'Angle', value: 180 })
+  assert.equal(facade.app.document.getObject('revolution')?.properties.find((property) => property.name === 'Angle')?.value, 180)
+})
+
+test('Part workbench commands create primitive and boolean document objects', () => {
+  const facade = createMockFacade()
+  facade.gui.workbench.setActive('Part')
+  assert.equal(facade.gui.command.getState('primitive').status, 'enabled')
+  assert.equal(facade.gui.command.getState('check-shape').status, 'enabled')
+  facade.gui.command.execute({ commandId: 'check-shape' })
+  assert.equal(facade.getState().diagnostics.at(-1)?.code, 'SHAPE_NOT_RECOMPUTED')
+  facade.gui.command.execute({ commandId: 'primitive' })
+  facade.task.apply()
+  assert.equal(facade.app.document.getObject('box')?.typeId, 'Part::Box')
+  facade.gui.command.execute({ commandId: 'primitive' })
+  facade.task.update({ primitiveType: 'Cylinder', radius: 3, height: 12, angle: 180 })
+  facade.task.apply()
+  assert.equal(facade.app.document.getObject('cylinder')?.typeId, 'Part::Cylinder')
+  assert.equal(facade.app.document.getObject('cylinder')?.properties.find((property) => property.name === 'Radius')?.value, 3)
+  assert.equal(facade.app.document.getObject('cylinder')?.properties.find((property) => property.name === 'Height')?.value, 12)
+  assert.equal(facade.app.document.getObject('cylinder')?.properties.find((property) => property.name === 'Angle')?.value, 180)
+
+  assert.equal(facade.gui.command.getState('union').status, 'enabled')
+  facade.gui.command.execute({ commandId: 'union' })
+  facade.task.update({ base: 'box', tool: 'cylinder' })
+  facade.task.apply()
+  assert.equal(facade.app.document.getObject('union')?.typeId, 'Part::Fuse')
+  assert.equal(facade.app.document.getObject('union')?.properties.find((property) => property.name === 'Base')?.value, 'box')
+  assert.equal(facade.app.document.getObject('union')?.properties.find((property) => property.name === 'Tool')?.value, 'cylinder')
+  assert.deepEqual(facade.app.document.getDependencies().filter((edge) => edge.sourceId === 'union').map((edge) => edge.targetId).sort(), ['box', 'cylinder'])
+  facade.selection.select('origin')
+  assert.equal(facade.gui.command.getState('union').status, 'disabled')
+  assert.match(facade.gui.command.getState('union').reason || '', /solid or shape-producing/)
+  assert.equal(facade.gui.command.getState('check-shape').status, 'disabled')
 })