diff --git a/config/chrome-opfs-migration-verification.json b/config/chrome-opfs-migration-verification.json
index 90505e5..f61b098 100644
--- a/config/chrome-opfs-migration-verification.json
+++ b/config/chrome-opfs-migration-verification.json
@@ -5,13 +5,16 @@
   "status": "pass",
   "migration": {
     "sourceSchemaVersion": 1,
-    "migratedSchemaVersion": 6,
+    "migratedSchemaVersion": 7,
     "migratedDocumentVersion": 3,
     "migratedLabel": "Legacy OPFS project",
     "migratedObjectCount": 1,
+    "migratedNativeObjectTag": 1,
     "recomputeDefaulted": true,
-    "reopenedSchemaVersion": 6,
+    "reopenedSchemaVersion": 7,
     "reopenedVersion": 4,
+    "reopenedNativeObjectTag": 17,
+    "checkpointNativeObjectTag": 17,
     "reopenedLabel": "Migrated OPFS project",
     "checkpointVersion": 4,
     "recoveryIntegrity": "ok",
@@ -28,9 +31,9 @@
     ]
   },
   "cleanup": {
-    "databasePath": "/bitbybit-rel02-301b6b76-9ab6-44ef-bf40-f2e6052e58ae.sqlite3",
+    "databasePath": "/bitbybit-rel02-976dea78-76e4-4a2b-afce-c0a2da583550.sqlite3",
     "removedFiles": [
-      "bitbybit-rel02-301b6b76-9ab6-44ef-bf40-f2e6052e58ae.sqlite3"
+      "bitbybit-rel02-976dea78-76e4-4a2b-afce-c0a2da583550.sqlite3"
     ]
   }
 }
diff --git a/config/compatibility-matrix.json b/config/compatibility-matrix.json
index a7b9621..5f3f903 100644
--- a/config/compatibility-matrix.json
+++ b/config/compatibility-matrix.json
@@ -100,6 +100,18 @@
         "exactBlockers": ["shipped Worker lacks the FreeCAD-linked private naming ABI implementation", "browser builder naming evidence transport", "non-unique isomorphic source"]
       }
     },
+    "freecadNamingBuild": {
+      "status": "contract-only",
+      "sdkEnvironment": "FREECAD_WASM_SDK_DIR",
+      "requiredManifest": "manifest.json",
+      "requiredCallbacks": ["freecadNamingAbiVersion", "freecadNamingCapabilitiesJson", "freecadNamingEvidenceJson"],
+      "requiredFreecadVersion": "1.1.1",
+      "requiredSourceCommit": "0108fd4b4850cc46e625b60e53cea7a7bbe69f8d",
+      "requiredEmscriptenVersion": "3.1.69",
+      "buildCommand": "./npmw run build:freecad-naming-worker",
+      "checkCommand": "./npmw run check:freecad-naming-sdk",
+      "statusBoundary": "Missing SDK or callback probe keeps EX-TSN-02=in_progress and systemExact=false"
+    },
     "browserWorker": {
       "entry": "src/facade/nativeHistoryWorkerEntry.ts",
       "client": "src/facade/nativeHistoryWorkerClient.ts",
@@ -117,7 +129,7 @@
   "facadeCapabilities": {
     "geometry": { "level": "experimental", "provider": "BitBybit OCCT 1.1.1", "operations": ["box", "cylinder", "sphere", "cone", "placement", "object-placement-recompute", "placement-validation", "mirror-plane", "mirrored-whole-shape", "multi-transform-whole-shape", "union", "cut", "intersection", "part-primitive-recompute", "part-boolean-recompute", "shape-check", "pad", "pocket", "pocket-through-all", "revolution", "loft", "pipe", "fillet", "chamfer", "linear-pattern-whole-shape", "polar-pattern-whole-shape", "hole-basic-origin-normal", "feature-shape-cache", "face-edge-vertex-topology", "native-cross-feature-history-routing", "step-export", "stl-export"], "featureLevels": { "pad": { "level": "compatible", "exactBlockedBy": ["native MappedNameRef/StringHasher evidence when provider omits it"] }, "pocket": { "level": "compatible", "exactBlockedBy": ["native MappedNameRef/StringHasher evidence when provider omits it"] }, "revolution": { "level": "compatible", "exactBlockedBy": ["native MappedNameRef/StringHasher evidence when provider omits it"] }, "groove": { "level": "compatible", "exactBlockedBy": ["native MappedNameRef/StringHasher evidence when provider omits it", "OCCT/FreeCAD private token generation"] }, "boolean": { "level": "compatible", "exactBlockedBy": ["native MappedNameRef/StringHasher evidence when provider omits it", "isomorphic source ambiguity"] }, "fillet": { "level": "experimental", "exactBlockedBy": ["complete cross-feature native stage history"] }, "chamfer": { "level": "experimental", "exactBlockedBy": ["complete cross-feature native stage history"] }, "multi-transform": { "level": "experimental", "exactBlockedBy": ["feature-list native history", "private naming tokens"] } } },
     "document": { "level": "experimental", "operations": ["typed-properties", "property-vector", "property-placement", "property-multi-transform", "property-link-list", "property-string-list", "property-link-sub", "expressions", "units", "dependency-dag", "parallel-level-recompute", "sync-recompute", "async-generation-recompute", "root-cause-diagnostics", "repair-branch-recompute", "versioned-toporef", "toporef-migration", "generation-topology-snapshot", "linksub-external-geometry-migration", "ambiguous-deleted-topology-diagnostics", "adjacency-fingerprint-disambiguation", "toporef-candidate-replacement-transaction", "signature-topology-history-fallback", "native-topology-history-adapter", "native-cross-feature-history-routing", "runtime-mapped-name-ref-evidence", "string-hasher-evidence-validation", "element-map2-multi-stage-name-mapping", "isomorphic-candidate-persistence", "element-map-name-contract", "undo-redo"] },
-    "persistence": { "level": "experimental", "provider": "SQLite WASM + OPFS with transient fallback", "operations": ["schema-v6", "object-topology-snapshots", "transactional-migrations", "migration-rollback", "serialized-write-queue", "five-version-checkpoints", "checkpoint-load", "recovery-report", "content-addressed-resources", "quota-preflight", "resource-sweep-plan", "opfs-orphan-sweep", "cross-tab-lock-notice"] },
+    "persistence": { "level": "experimental", "provider": "SQLite WASM + OPFS with transient fallback", "operations": ["schema-v7", "stable-native-object-tags", "object-topology-snapshots", "transactional-migrations", "migration-rollback", "serialized-write-queue", "five-version-checkpoints", "checkpoint-load", "recovery-report", "content-addressed-resources", "quota-preflight", "resource-sweep-plan", "opfs-orphan-sweep", "cross-tab-lock-notice"] },
     "sketcher": { "level": "experimental", "provider": "typescript-basic; FreeCAD 1.1.1 planegcs WASM core installed", "operations": ["point-line-circle-arc-model", "ellipse-bspline-periodic-model", "construction-geometry", "geometry-validation", "stable-geometry-signature", "stable-external-geometry-model", "basic-constraints", "advanced-constraint-proxy", "diameter-symmetric-tangent", "basic-solver", "versioned-solver-protocol", "solver-capability-probe", "cancel-stale-isolation", "replay-contract", "planegcs-native-system-solve", "planegcs-horizontal-distance", "planegcs-vertical-distance", "planegcs-distance-x", "planegcs-distance-y", "planegcs-angle", "planegcs-circle-radius", "planegcs-circle-diameter", "planegcs-equal-lines", "planegcs-equal-circles", "planegcs-tangent-circles", "planegcs-point-symmetry", "planegcs-point-on-object", "planegcs-point-on-arc", "planegcs-point-on-ellipse", "planegcs-point-on-cubic-bspline", "planegcs-block-freeze", "planegcs-parallel-lines", "planegcs-perpendicular-lines", "planegcs-coincident-lines", "planegcs-snells-law-lines", "planegcs-ellipse-internal-alignment", "planegcs-cubic-bspline-weight", "planegcs-dedicated-worker-smoke", "persistence"] },
     "fcstd": { "level": "read-only", "operations": ["zip-preflight", "document-xml-metadata", "document-property-projection", "live-topology-element-map", "proxy-report", "script-isolation"] },
     "viewport": { "level": "experimental", "provider": "Three.js WebGL2", "operations": ["mesh-rendering", "multi-object-mesh-registry", "view-orientation", "fit-and-zoom", "subshape-triangle-mapping", "subshape-click-selection", "subshape-hover-preselection", "subshape-hover-highlight", "occt-analytic-picking-topology", "brep-edge-polyline-picking", "edge-pixel-tolerance-picking", "vertex-pixel-tolerance-picking", "diagnostic-selection-flash", "multi-object-selection-set", "modifier-box-selection-gesture", "window-contained-box-selection", "crossing-intersection-box-selection", "multi-object-selection-highlight", "object-visibility-projection", "selection-resource-release"] },
diff --git a/config/freecad-web-exact-parity-plan.json b/config/freecad-web-exact-parity-plan.json
index 744e2ae..c7c8479 100644
--- a/config/freecad-web-exact-parity-plan.json
+++ b/config/freecad-web-exact-parity-plan.json
@@ -32,7 +32,7 @@
         { "id": "EX-KER-01", "title": "Match OCCT construction, validation, tolerances and failure diagnostics", "priority": "P0", "status": "in_progress", "dependencies": ["EX-ORA-02"], "deliverables": ["Per-operation native differential", "Tolerance and placement contract", "Failure-code map"], "acceptance": ["Shape validity, topology, mass properties and diagnostics match locked FreeCAD fixtures", "Worker ownership returns to zero after every case"], "evidence": ["check:browser-occt", "check:chrome-geometry-features"], "exactBlockedBy": ["Not all FreeCAD builder flags and failure branches are represented"] },
         { "id": "EX-TSN-00", "title": "Fail closed when native naming or builder evidence is absent", "priority": "P0", "status": "completed", "dependencies": [], "deliverables": ["Runtime naming evidence contract", "final-shape-only and ambiguous persistence", "ElementMap2 writer evidence guard"], "acceptance": ["Final geometry cannot mint a private FreeCAD token", "Unproven stage relations and isomorphic sources cannot become stable"], "evidence": ["check:freecad-native-naming-evidence", "check:freecad-exact-history-elementmap-gate"], "exactBlockedBy": [] },
         { "id": "EX-TSN-01", "title": "Capture native stage Shape and Generated/Modified/Deleted for every builder", "priority": "P0", "status": "completed", "dependencies": ["EX-KER-01", "EX-TSN-00"], "deliverables": ["All builder-stage captures", "Multi-input and one-to-many lineage", "Local feature recompute history"], "acceptance": ["Every feature result relation has a producing native stage", "No final-result index is applied to an intermediate Shape"], "evidence": ["check:freecad-composite-history-elementmap", "check:freecad-tsn-stage-evidence"], "exactBlockedBy": [] },
-        { "id": "EX-TSN-02", "title": "Expose native MappedNameRef and StringHasher decisions for every feature", "priority": "P0", "status": "in_progress", "dependencies": ["EX-TSN-01"], "deliverables": ["Native naming callback ABI", "Per-stage StringHasher evidence", "Lossless ElementMap2 token generation"], "acceptance": ["All new tokens originate in native evidence", "FreeCAD round-trip names remain byte and semantic stable"], "evidence": ["check:freecad-native-naming-evidence", "check:freecad-sketcher-partdesign-abi"], "exactBlockedBy": ["The shipped Worker does not link the FreeCAD private naming implementation for every builder"] },
+        { "id": "EX-TSN-02", "title": "Expose native MappedNameRef and StringHasher decisions for every feature", "priority": "P0", "status": "in_progress", "dependencies": ["EX-TSN-01"], "deliverables": ["Native naming callback ABI", "Per-stage StringHasher evidence", "Lossless ElementMap2 token generation"], "acceptance": ["All new tokens originate in native evidence", "FreeCAD round-trip names remain byte and semantic stable"], "evidence": ["check:freecad-native-naming-evidence", "check:freecad-sketcher-partdesign-abi", "check:freecad-naming-sdk", "check:occt-history-artifact"], "exactBlockedBy": ["The shipped Worker does not link the FreeCAD private naming implementation for every builder"] },
         { "id": "EX-TSN-03", "title": "Resolve isomorphic topology only from unique native provenance", "priority": "P0", "status": "in_progress", "dependencies": ["EX-TSN-01", "EX-TSN-02"], "deliverables": ["Symmetric Boolean corpus", "Candidate provenance graph", "Ambiguity repair lifecycle"], "acceptance": ["Unique native sources resolve deterministically", "Non-unique sources remain ambiguous across save, undo and recompute"], "evidence": ["test:topology-replay", "check:freecad-exact-history-elementmap-gate"], "exactBlockedBy": ["Symmetric cases without unique native provenance remain intentionally ambiguous"] },
         { "id": "EX-TSN-04", "title": "Close topology naming across all feature edits and FCStd round-trips", "priority": "P0", "status": "pending", "dependencies": ["EX-TSN-02", "EX-TSN-03"], "deliverables": ["Cross-feature mutation matrix", "ElementMap2 history migration", "Long-chain LinkSub stability report"], "acceptance": ["Wrong bindings, unexplained relations and name drift are zero for the exhaustive corpus"], "evidence": ["check:freecad-fcstd-roundtrip", "check:freecad-exact-history-elementmap-gate"], "exactBlockedBy": ["Exhaustive cross-feature naming corpus is incomplete"] }
       ]
diff --git a/config/project-migration-verification.json b/config/project-migration-verification.json
index d32f0db..8b04ead 100644
--- a/config/project-migration-verification.json
+++ b/config/project-migration-verification.json
@@ -1,82 +1,98 @@
 {
   "schemaVersion": 1,
   "status": "pass",
-  "currentSchemaVersion": 6,
+  "currentSchemaVersion": 7,
   "migrationVersions": [
     1,
     2,
     3,
     4,
     5,
-    6
+    6,
+    7
   ],
-  "migrationSha256": "0308954a28a2cd5d98888cd9c97c25170760e00f8cb16133a51414c5ebedb5a0",
+  "migrationSha256": "ab987867c4935f60198ec19fb69259f6fc95167005bbb4f40e11723a52392f1d",
   "forward": [
     {
       "from": 0,
-      "to": 6,
+      "to": 7,
       "applied": [
         1,
         2,
         3,
         4,
         5,
-        6
+        6,
+        7
       ],
       "committed": true,
       "rolledBack": false
     },
     {
       "from": 1,
-      "to": 6,
+      "to": 7,
       "applied": [
         2,
         3,
         4,
         5,
-        6
+        6,
+        7
       ],
       "committed": true,
       "rolledBack": false
     },
     {
       "from": 2,
-      "to": 6,
+      "to": 7,
       "applied": [
         3,
         4,
         5,
-        6
+        6,
+        7
       ],
       "committed": true,
       "rolledBack": false
     },
     {
       "from": 3,
-      "to": 6,
+      "to": 7,
       "applied": [
         4,
         5,
-        6
+        6,
+        7
       ],
       "committed": true,
       "rolledBack": false
     },
     {
       "from": 4,
-      "to": 6,
+      "to": 7,
       "applied": [
         5,
-        6
+        6,
+        7
       ],
       "committed": true,
       "rolledBack": false
     },
     {
       "from": 5,
-      "to": 6,
+      "to": 7,
       "applied": [
-        6
+        6,
+        7
+      ],
+      "committed": true,
+      "rolledBack": false
+    },
+    {
+      "from": 6,
+      "to": 7,
+      "applied": [
+        7
       ],
       "committed": true,
       "rolledBack": false
@@ -138,6 +154,19 @@
       ],
       "committed": false,
       "rolledBack": true
+    },
+    {
+      "failedAt": 7,
+      "restoredVersions": [
+        1,
+        2,
+        3,
+        4,
+        5,
+        6
+      ],
+      "committed": false,
+      "rolledBack": true
     }
   ],
   "idempotentRerun": {
diff --git a/config/release-artifacts.json b/config/release-artifacts.json
index 101522f..30b674a 100644
--- a/config/release-artifacts.json
+++ b/config/release-artifacts.json
@@ -22,25 +22,25 @@
         "bytes": 556597,
         "sha256": "1679307fb0f01e9d7b9f37a081458bf44583e4d1899edf9224b49a1435ce7105"
       },
+      {
+        "path": "assets/index-B7ENiszF.js",
+        "bytes": 1134628,
+        "sha256": "53bd3b2876d56238158be315cfdf8d7143767c46c0a429271d9985c36f003ca4"
+      },
       {
         "path": "assets/index-BnRqhr3m.css",
         "bytes": 65976,
         "sha256": "b8eacf86224d2705e3c27367b3a0b166f4d662a5b8142d34a8abcdeef58753ec"
       },
       {
-        "path": "assets/index-ChdGmY7w.js",
-        "bytes": 1130165,
-        "sha256": "c508b701c47d2dea412c96f3a529f99b42bd7b137e647d958b993c3268dfc3e6"
+        "path": "assets/nativeHistoryWorkerEntry-C7hZKjun.js",
+        "bytes": 21764,
+        "sha256": "a4fbc5e765e1d919c8f066b6b07e2064f62e3c291496972a2b4006069a17902b"
       },
       {
-        "path": "assets/nativeHistoryWorkerEntry-gNsJxM2G.js",
-        "bytes": 20437,
-        "sha256": "39c26691ba3275ce5fbb3a43239d5511430bc0222259f0c76e3aa9314f2e87cf"
-      },
-      {
-        "path": "assets/persistenceWorker-CyD5EUVX.js",
-        "bytes": 241190,
-        "sha256": "65a24ca0125444e3047f409d3b1c3667321e392a0ca9ddf64df6b728a1544c66"
+        "path": "assets/persistenceWorker-DQjay47f.js",
+        "bytes": 242249,
+        "sha256": "fa86b0667f07d1986e2d6dd50ee08ac291f83de07ab132db2ec13f306d49402b"
       },
       {
         "path": "assets/planegcsWorkerEntry-BeAnOOBp.js",
@@ -219,8 +219,8 @@
       },
       {
         "path": "chrome-opfs-migration-harness.html",
-        "bytes": 7032,
-        "sha256": "53203065bbc2937f63b7e0a9d17dd9a4e27396bbcef0766a87d5b8be45c8fb49"
+        "bytes": 7518,
+        "sha256": "553387802e86572a416bdd78a34d5e54855f6390f531f728c4749b5901e6c945"
       },
       {
         "path": "chrome-partdesign-lifecycle-harness.html",
@@ -330,7 +330,7 @@
       {
         "path": "index.html",
         "bytes": 678,
-        "sha256": "ce1c0c151dfb290cff01268efaec2efd0cdc354548ffccb5cb1030b02249870f"
+        "sha256": "019c7f7b5255a12f94a19ae72edc50a45343e81779bed1b68842a934b31da01a"
       },
       {
         "path": "manifest.webmanifest",
@@ -380,7 +380,7 @@
       {
         "path": "sw.js",
         "bytes": 1390,
-        "sha256": "a8d35592358f8580b3be765a36897969c63ebfb7c777a71296481e0d8118fad7"
+        "sha256": "5389aba344f93a8948bfed30aa20c0a1c38cdba7d9ebf120964d0897bba7e8cc"
       },
       {
         "path": "vendor/camotics/camotics-sweep.wasm",
@@ -402,7 +402,7 @@
     "status": "signed",
     "algorithm": "Ed25519",
     "keyId": "bitbybit-local-release-2026",
-    "payloadSha256": "be48e099205c1a86339eb4560e62ed88e12ffd0e2e45e036f3a723abd3bb078a",
-    "signature": "AAyAo8hzt1I48LaHUArN7lEg11zWrl3EkNKF6zr92x2SZHFhXq/5m8KZ0hqJxNU4INM6bC/laqanCJ9GhRbkCQ=="
+    "payloadSha256": "20fb0fbc84390befc6fa22358b25cc139fb9dde8829643b5fc4ab3e804c44181",
+    "signature": "QyhRB17NFPFu9Nda1rU2KW+Lv5yROFM9Lo0vY9hOexecfwzb3PWw+XWHymLc1/hYjBm3Hw7dPdQ8Ou2KapWmBg=="
   }
 }
diff --git a/docs/freecad-full-parity-plan.zh-CN.md b/docs/freecad-full-parity-plan.zh-CN.md
index 8080bc5..3d445bd 100644
--- a/docs/freecad-full-parity-plan.zh-CN.md
+++ b/docs/freecad-full-parity-plan.zh-CN.md
@@ -333,7 +333,7 @@ Bitbybit 必须被充分用作几何、Worker、IO、三角化和缓存的首选
 
 属性领域合同现覆盖标量、枚举、颜色、Vector、Placement、ObjectLink、ObjectLinkList/StringList 和版本化 SubshapeLink。Placement/Vector 使用结构化值并做有限数、角度范围及非零旋转轴校验，复合值深拷贝进入 Undo/Redo 与持久化。Facade 的对象级几何重算已在 Shape 生成后执行 Placement，并对恒等变换、畸形结构、变换失败释放和最近有效缓存保留给出测试证据；这不是 FreeCAD Body/Tip、Support、AttachmentOffset 或特征局部坐标链的等价实现，File/Shape 摘要和多选 mixed 编辑也仍未完成。
 
-TSN 已完成面/边/顶点量化签名、邻接指纹消歧和匹配 API，并挂接到实际重算 generation。成功 Shape 会产生对象拓扑快照、迁移 matches、`signature-fallback`/`occt-native` 历史和 schema v1 ElementMap；提交阶段自动写回 LinkSub 与草图外部几何，稳定引用更新 generation，歧义/删除引用保持显式状态、标脏所有者并产生修复诊断。候选替换 Facade 事务验证当前拓扑和 kind 后原子写入 stable TopoRef，重建 DAG、进入 Undo/Redo；属性面板和诊断页均通过 Facade 调用。schema v6 保存快照。Three.js 已支持多对象 Mesh 注册、OCCT analytic 面/边/顶点点击、预选、完整边折线高亮、window/crossing 框选和诊断聚焦闪烁；普通单向 Pad/Pocket/Revolution/Groove 已接入已有 OCCT `Generated/Modified/Deleted` provider，其余复合模式仍显式回退。
+TSN 已完成面/边/顶点量化签名、邻接指纹消歧和匹配 API，并挂接到实际重算 generation。成功 Shape 会产生对象拓扑快照、迁移 matches、`signature-fallback`/`occt-native` 历史和 schema v1 ElementMap；提交阶段自动写回 LinkSub 与草图外部几何，稳定引用更新 generation，歧义/删除引用保持显式状态、标脏所有者并产生修复诊断。候选替换 Facade 事务验证当前拓扑和 kind 后原子写入 stable TopoRef，重建 DAG、进入 Undo/Redo；属性面板和诊断页均通过 Facade 调用。schema v7 保存拓扑快照和稳定原生对象标签。Three.js 已支持多对象 Mesh 注册、OCCT analytic 面/边/顶点点击、预选、完整边折线高亮、window/crossing 框选和诊断聚焦闪烁；普通单向 Pad/Pocket/Revolution/Groove 已接入已有 OCCT `Generated/Modified/Deleted` provider，其余复合模式仍显式回退。
 
 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。
 
@@ -359,7 +359,7 @@ PartDesign Mirrored 已形成 experimental whole-shape 垂直切片：Facade 验
 | 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 |
-| P2-01/P2-02 Migration/write pressure | schema v6 与统一事务 migration runner；v6 新增对象拓扑快照 JSON；失败 rollback；写队列严格串行并在失败后继续 | migration 排序/跳过/回滚测试、拓扑快照 fallback 往返及 1000 次队列压力通过 | SQLite v4→v5→v6 的真实 OPFS 浏览器升级、崩溃注入与发布回滚演练仍待完成 |
+| P2-01/P2-02 Migration/write pressure | schema v7 与统一事务 migration runner；v6 新增对象拓扑快照 JSON，v7 新增稳定原生对象标签；失败 rollback；写队列严格串行并在失败后继续 | migration 排序/跳过/回滚测试、真实 Chrome OPFS v1→v7、标签重开/checkpoint 往返及 1000 次队列压力通过 | 跨发布降级、断电 journal 恢复和用户数据备份仍待完成 |
 | P2-03 Resource/recovery fallback | SQLite Worker 在无 OPFS 时使用内存资源表；OPFS 模式增加配额预留、重复内容免写、缺失文件重建和孤儿/零引用/缺失文件对账清扫；Facade 暴露 sweep 报告 | quota/sweep 纯策略、fallback API、Worker 类型检查和生产构建通过 | 真实 OPFS 孤儿清扫、QuotaExceeded、大文件压力及浏览器崩溃注入仍待完成 |
 | P2-04 Version checkpoints | 文档规范化保存与完整 JSON checkpoint 同事务；每文档保留最近 5 版；Recovery 列出版本，Facade 可加载指定/最新 checkpoint | 7 版保存后仅保留 3..7、指定版本/最新版加载、过期版本删除和深克隆测试通过 | 当前测试使用 transient fallback；SQLite/OPFS 断电点恢复和保留策略 UI 待完成 |
 | 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 |
@@ -368,7 +368,7 @@ PartDesign Mirrored 已形成 experimental whole-shape 垂直切片：Facade 验
 | P3-07 MultiTransform 实验切片 | `multi-transform` 使用结构化有序 Linear/Polar/Mirrored 步骤，Task 与属性面板共用编辑器；重算逐步扩展 whole-shape 实例并最终 union，限制最多 6 步和 100 个组合实例 | 6 实例组合、方向/平面映射、故障注入、中间 Shape 完整回收、最近有效缓存、深拷贝、Undo/Redo、fallback 保存恢复与任务提交测试通过 | 不是 FreeCAD 局部 Transform feature history；未实现特征列表、Datum/TopoRef 轴面、单实体规则与原生拓扑历史，保持 `experimental` |
 | P3-05 Hole 基础切片 | `hole` 创建 `PartDesign::Hole`，用 32 边圆形 Profile 或圆锥刀具调用现有 OCCT Pocket/Cut；支持 Diameter、DepthType/Depth、Position/Direction、Reversed、Flat/Angled DrillPoint、DrillForDepth、Tapered/TaperedAngle 以及 Dimension/ThroughAll，校验正尺寸并纳入 Base 链接和 Body.Tip | 圆孔 Profile、有限深度调用、位置/方向、90 度基准锥度、包含钻尖总深度、非法直径/方向诊断、Task 属性提交和 Tip 更新测试通过；Counterbore/Countersink/Counterdrill、Angled drill point 和 Tapered 由 Bitbybit 圆柱/圆锥刀具加 Boolean Cut 组合执行，并有 Chrome 非空 mesh 与 0/0 release 证据 | 仍未实现 Threaded/ModelThread、标准尺寸、Support/Profile 面定位和完整局部特征历史；螺纹保持显式 `HOLE_THREADING_UNSUPPORTED`，能力保持 `experimental` |
 | TSN-02/05/06/08 TopoRef 基础迁移 | `topologyReferences` 提供 schema v1 创建、序列化、安全解析、解析和跨版本迁移；重复几何通过邻接指纹唯一消歧，一旧多新不会错误继承；匹配按 kind 隔离并用形状尺度归一化几何评分支持纯平移；对象快照附带 schema v1 ElementMap；新增原生 ElementMap2 v1 token AST/schema v2 writer，以及 StringHasher v1 AST/schema v2 codec | round-trip、瞬时索引拒绝、resolved/ambiguous/deleted、重复拆分、邻接唯一/对称回归、FaceN/EdgeN/VertexN 写出和持久化通过；FreeCAD 1.1.1 的 30 模型、91 个 ElementMap2、11 个 StringHasher 表完成解析、写回和引用闭合 | Web 拓扑仍不能凭最终几何生成 FreeCAD 私有算法未提供的历史 token/StringID；对称 Boolean 的同构子形需要原生候选证据才能消歧 |
-| TSN-08/09 LinkSub 文档接线 | `PropertyValue` 支持 schema v1 TopoRef；重算 generation 自动迁移 LinkSub/草图外部几何，歧义/删除不强绑；schema v6 保存对象拓扑快照与 ElementMap；Facade 候选替换事务验证当前同 kind persistentId，重建 DAG 并支持 Undo/Redo；属性/诊断 UI 可替换；Three.js 多 Mesh 场景已将对象/OCCT analytic 面边点拾取、预选、完整曲线折线高亮、诊断闪烁和 window/crossing 框选回调 Facade；Pocket 暴露 `UpToFace` 槽；Pocket/Groove/Hole/MultiTransform 及双侧线性/角度特征可携带内部 builder 的 STEP/topology/history stage；ElementMap2 writer 可从 MappedNameRef/StringID 证据生成 FreeCAD 1.1.1 token，FCStd reader/writer 会校验 StringHasher 引用闭包 | 非法瞬时索引/候选拒绝、DAG 边、稳定/歧义/删除迁移、邻接消歧、候选替换、Undo/Redo、保存加载、无三角对角线的 BRep 边拾取、多选集合、真实双对象穿越框、诊断聚焦事件、live ElementMap、Pocket 双侧、Revolution/Groove 双角 Chrome 回放及 30 模型 naming-evidence gate 通过 | 未提供逐阶段 Shape/history 或 MappedNameRef/StringHasher 证据的算法继续保守回退；同构子形无唯一原生证据时不宣称 exact |
+| TSN-08/09 LinkSub 文档接线 | `PropertyValue` 支持 schema v1 TopoRef；重算 generation 自动迁移 LinkSub/草图外部几何，歧义/删除不强绑；schema v7 保存对象拓扑快照、ElementMap 与稳定原生对象标签；Facade 候选替换事务验证当前同 kind persistentId，重建 DAG 并支持 Undo/Redo；属性/诊断 UI 可替换；Three.js 多 Mesh 场景已将对象/OCCT analytic 面边点拾取、预选、完整曲线折线高亮、诊断闪烁和 window/crossing 框选回调 Facade；Pocket 暴露 `UpToFace` 槽；Pocket/Groove/Hole/MultiTransform 及双侧线性/角度特征可携带内部 builder 的 STEP/topology/history stage；ElementMap2 writer 可从 MappedNameRef/StringID 证据生成 FreeCAD 1.1.1 token，FCStd reader/writer 会校验 StringHasher 引用闭包 | 非法瞬时索引/候选拒绝、DAG 边、稳定/歧义/删除迁移、邻接消歧、候选替换、Undo/Redo、保存加载、无三角对角线的 BRep 边拾取、多选集合、真实双对象穿越框、诊断聚焦事件、live ElementMap、Pocket 双侧、Revolution/Groove 双角 Chrome 回放及 30 模型 naming-evidence gate 通过 | 未提供逐阶段 Shape/history 或 MappedNameRef/StringHasher 证据的算法继续保守回退；同构子形无唯一原生证据时不宣称 exact |
 | TSN-03/07 历史适配器回退 | Bitbybit 1.1.1 绑定仅有 `HasGenerated()`，没有逐 Shape 的 Generated/Modified/IsDeleted；独立 native provider 已接入普通及双侧 Pad/Pocket/Revolution/Groove 参数路由与既有 Boolean/Pattern/Dress-up 子集；协议新增显式 input/stage、sourceStage/resultStage、一对多 resultIndexes、有序 feature sides 和 rotate stage，可向后兼容旧 object/tool 载荷；stage capture 按各自产生结果解释 index 并以邻接唯一性约束同构候选 | 平移修改、新增/删除/重复面、邻接唯一消歧、跨对象竞争、generation 写回、采集失败隔离、Up-to-face 有效距离、Two sides/Midplane/Two angles 路由通过；Groove 双角按 FreeCAD profile offset + 单 sweep + Cut 得到 native valid 单 solid；30 模型 history/ElementMap2/StringHasher exact gate 与 Facade `182/182` 通过 | provider 仍通过 STEP/BREP 跨 WASM；同构候选和未提供私有 builder/命名证据的算法仍需逐项黄金模型后才能声明 exact |
 
 原生历史 provider 适配器现已进入重算执行器：当 Geometry Worker 暴露 `topologyHistory()` 且 Base/Tool/Profile 有拓扑快照时，Facade 将真实输入/输出 Shape 和记录交给 `captureNativeTopologyHistoryStages()`，再由 `composeNativeTopologyHistoryLineage()` 把上游对象 stage 接入当前关系；普通 Pad/Pocket/Revolution/Groove、Up-to-face 有效长度以及双侧/Midplane/Two angles 会进入同一参数协议。Pocket、Hole、MultiTransform 和双侧 builder 保存中间 STEP/拓扑/记录；Groove TwoAngles 按 FreeCAD 语义保存 `rotate -> revolution -> cut` 的 BREP/history，并已通过 native BRepCheck Chrome 黄金门。provider 不声明组成 operation 时保留单响应兼容路径。exact 判定仍必须同时拥有逐阶段 Shape/history 与 MappedNameRef/StringHasher 命名证据，任一缺失都不能由最终几何补推。
@@ -391,6 +391,8 @@ PartDesign Mirrored 已形成 experimental whole-shape 垂直切片：Facade 验
 
 `FreeCADPrivateNamingABI v1` 已定义为版本化 Embind/JSON 合同，并接入 direct provider 与真实 Worker：请求携带 operation、输入 STEP、最终 STEP/BRep、阶段 DAG 和原生 history，响应必须同时提供 `MappedNameRef`、StringHasher 与 ElementMap2，且逐项通过 stage/result 绑定、大小上限、schema、StringID 和引用闭包校验。生产运行时声明 `freecad-private-v1-optional-worker`，mock 明确为 `not-exposed`；未导出三项回调、版本/锁定提交不符、证据不闭合或 operation 未声明时均 fail-closed 到 `final-shape-only`，禁止合成 token。当前仓库随附的 `native/occt-history` 仍是 OCCT-only artifact，没有链接 FreeCAD 私有实现，因此这里只完成 ABI 与传输边界，不把浏览器实时私有命名提升为 exact。
 
+ABI 输入现同时携带文档 `objectId`、FCStd 原生正整数 object tag、上一阶段命名证据、明确的 result object/tag 和阶段 DAG；object tag 会从 `Document.xml` 的 `Object.id` 导入，按稳定值写回 FCStd，并通过 SQLite schema v7、OPFS 重开和 checkpoint 往返。`build:freecad-naming-worker` 是独立的 fail-closed 构建入口，只接受锁定提交、Emscripten 3.1.69、wasm Qt/Python、FreeCADBase/FreeCADApp/Part 静态库及三回调 bridge 的哈希清单；普通 `build:occt-history` 继续是 OCCT-only。`check:occt-history-artifact` 会实际实例化 WASM 并探测三回调，当前结果为 unavailable，因此 `EX-TSN-02=in_progress` 与 `systemExact=false` 保持不变。
+
 Sketcher/PartDesign 的 Web 支持范围新增可执行参数合同：Sketcher 覆盖 FreeCAD 1.1.1 FCStd 表面的 9 类 geometry、19 类 constraint 和 10 类 InternalAlignment 语义；PartDesign 覆盖 Facade 已支持的 21 个 family、202 个属性槽和 72 个语义分区，并在对象创建及属性编辑时执行跨字段校验。`check:freecad-sketcher-partdesign-abi` 会从实现重算这些计数并拒绝陈旧报告；该“完整”限定于 supported Web Facade，不包含尚未实现的 FreeCAD PartDesign TypeId，也不表示 basic TypeScript solver 已求解全部圆锥曲线约束。
 
 逐 feature 等级目前由 `config/compatibility-matrix.json` 的 `facadeCapabilities.geometry.featureLevels` 管理：Pad/Pocket/Revolution/Groove/Boolean 为有 native history 子集的 `compatible`，Fillet/Chamfer/MultiTransform 保持 `experimental`。`systemExactEvaluation.exact` 必须在所有 feature 的阶段 Shape/history、私有 token 证据和同构来源都闭合后才允许改为 true；当前值固定为 false，阻断项为私有 FreeCAD token 算法、没有原生 builder stage、以及无唯一同构来源。
diff --git a/native/occt-history/CMakeLists.txt b/native/occt-history/CMakeLists.txt
index 204445e..a576cb6 100644
--- a/native/occt-history/CMakeLists.txt
+++ b/native/occt-history/CMakeLists.txt
@@ -13,6 +13,18 @@ find_package(OpenCASCADE REQUIRED CONFIG PATHS "${OCCT_DIR}" NO_DEFAULT_PATH)
 add_executable(bitbybit_occt_history occt_history.cpp)
 target_include_directories(bitbybit_occt_history PRIVATE "${OCCT_DIR}/include/opencascade")
 target_link_libraries(bitbybit_occt_history PRIVATE TKDESTEP TKXSBase TKDE TKBO TKBRep TKTopAlgo TKPrim TKShHealing TKGeomAlgo TKGeomBase TKG3d TKG2d TKMath TKernel)
+if(FREECAD_WASM_SDK_DIR)
+  if(NOT FREECAD_NAMING_BRIDGE_SOURCE OR NOT EXISTS "${FREECAD_NAMING_BRIDGE_SOURCE}")
+    message(FATAL_ERROR "FREECAD_NAMING_BRIDGE_SOURCE must point to the verified FreeCAD private naming bridge source.")
+  endif()
+  if(NOT FREECAD_NAMING_INCLUDE_DIRS OR NOT FREECAD_NAMING_LIBRARIES)
+    message(FATAL_ERROR "FREECAD_NAMING_INCLUDE_DIRS and FREECAD_NAMING_LIBRARIES are required for a FreeCAD-linked Worker.")
+  endif()
+  target_sources(bitbybit_occt_history PRIVATE "${FREECAD_NAMING_BRIDGE_SOURCE}")
+  target_include_directories(bitbybit_occt_history PRIVATE ${FREECAD_NAMING_INCLUDE_DIRS})
+  target_link_libraries(bitbybit_occt_history PRIVATE ${FREECAD_NAMING_LIBRARIES})
+  target_compile_definitions(bitbybit_occt_history PRIVATE BITBYBIT_FREECAD_NAMING_LINKED=1)
+endif()
 target_compile_options(bitbybit_occt_history PRIVATE -fexceptions -O2)
 target_link_options(bitbybit_occt_history PRIVATE
   --bind
diff --git a/native/occt-history/README.md b/native/occt-history/README.md
index 50aec2f..850d448 100644
--- a/native/occt-history/README.md
+++ b/native/occt-history/README.md
@@ -19,6 +19,35 @@ The build also publishes the JS/WASM pair to
 clean checkout must run the build after restoring the pinned OCCT source and
 Emscripten toolchain.
 
+## FreeCAD private naming build boundary
+
+The default build is intentionally OCCT-only. It does not export
+`freecadNamingAbiVersion`, `freecadNamingCapabilitiesJson`, or
+`freecadNamingEvidenceJson`, and it must not be described as exact FreeCAD
+naming support.
+
+A separate fail-closed build lane is available for an actual FreeCAD WASM SDK:
+
+```bash
+FREECAD_WASM_SDK_DIR=/absolute/path/to/sdk ./npmw run check:freecad-naming-sdk
+FREECAD_WASM_SDK_DIR=/absolute/path/to/sdk ./npmw run build:freecad-naming-worker
+./npmw run check:occt-history-artifact
+```
+
+The SDK layout is defined by `freecad-wasm-sdk-manifest.example.json`. The
+checker requires the locked FreeCAD 1.1.1 commit, Emscripten 3.1.69, wasm Qt
+and Python targets, private App headers, hashed static FreeCAD/Part/Qt/Python
+libraries, and a hashed bridge source exporting all three callbacks. If any
+input is absent, `build:freecad-naming-worker` exits before rebuilding or
+publishing the OCCT-only artifact. A successful artifact probe still only
+establishes ABI linkage; exact promotion additionally requires valid
+MappedNameRef, StringHasher, ElementMap2, stage history, and round-trip evidence.
+
+The versioned JSON request carries document `objectId`, stable positive
+`objectTag`, prior naming evidence, result object identity, result tag, stage
+DAG, STEP/BRep, and OCCT Generated/Modified/Deleted history. No Web fallback is
+allowed to synthesize a FreeCAD private token.
+
 The exported `booleanHistory(object, tool, operation)` function supports
 `fuse`, `cut`, and `common`. It returns the native result shape, per-input
 `modified`/`generated`/`deleted` records, a validity/topology/quality summary,
diff --git a/native/occt-history/build.sh b/native/occt-history/build.sh
index 927eff6..1b8058f 100755
--- a/native/occt-history/build.sh
+++ b/native/occt-history/build.sh
@@ -7,6 +7,15 @@ OCCT_BUILD_DIR="${OCCT_BUILD_DIR:-${ROOT_DIR}/.cache/bitbybit/occt-history-build
 DIST_DIR="${OCCT_HISTORY_DIST_DIR:-${ROOT_DIR}/native/occt-history/dist}"
 PUBLIC_DIR="${OCCT_HISTORY_PUBLIC_DIR:-${ROOT_DIR}/public/native/occt-history}"
 JOBS="${JOBS:-$(nproc)}"
+FREECAD_WASM_SDK_DIR="${FREECAD_WASM_SDK_DIR:-}"
+
+if [[ "${FREECAD_WASM_NAMING_REQUIRED:-0}" == "1" && -z "${FREECAD_WASM_SDK_DIR}" ]]; then
+  echo "FREECAD_WASM_SDK_DIR is required for build:freecad-naming-worker; refusing to produce an OCCT-only artifact." >&2
+  exit 1
+fi
+if [[ -n "${FREECAD_WASM_SDK_DIR}" ]]; then
+  FREECAD_WASM_SDK_DIR="${FREECAD_WASM_SDK_DIR}" node "${ROOT_DIR}/scripts/check-freecad-naming-sdk.mjs" >/dev/null
+fi
 
 if [[ ! -f "${OCCT_SOURCE_DIR}/CMakeLists.txt" ]]; then
   echo "OCCT source checkout not found: ${OCCT_SOURCE_DIR}" >&2
@@ -47,7 +56,19 @@ cmake --build "${OCCT_BUILD_DIR}" --target \
   --parallel "${JOBS}"
 mkdir -p "${DIST_DIR}"
 
-em++ "${ROOT_DIR}/native/occt-history/occt_history.cpp" \
+SOURCES=("${ROOT_DIR}/native/occt-history/occt_history.cpp")
+INCLUDES=("-I${OCCT_BUILD_DIR}/include/opencascade" "-I${OCCT_SOURCE_DIR}/src")
+DEFINES=()
+FREECAD_LIBRARIES=()
+if [[ -n "${FREECAD_WASM_SDK_DIR}" ]]; then
+  BRIDGE_SOURCE="$(node -e 'const fs=require("node:fs"); const p=require("node:path"); const m=JSON.parse(fs.readFileSync(p.resolve(process.argv[1],"manifest.json"),"utf8")); console.log(p.isAbsolute(m.namingBridge.source) ? m.namingBridge.source : p.resolve(process.argv[1],m.namingBridge.source))' "${FREECAD_WASM_SDK_DIR}")"
+  SOURCES+=("${BRIDGE_SOURCE}")
+  while IFS= read -r include_dir; do INCLUDES+=("-I${include_dir}"); done < <(node -e 'const fs=require("node:fs"); const p=require("node:path"); const root=p.resolve(process.argv[1]); const m=JSON.parse(fs.readFileSync(p.resolve(root,"manifest.json"),"utf8")); for (const d of m.includeDirs) console.log(p.isAbsolute(d) ? d : p.resolve(root,d))' "${FREECAD_WASM_SDK_DIR}")
+  while IFS= read -r library; do FREECAD_LIBRARIES+=("${library}"); done < <(node -e 'const fs=require("node:fs"); const p=require("node:path"); const root=p.resolve(process.argv[1]); const m=JSON.parse(fs.readFileSync(p.resolve(root,"manifest.json"),"utf8")); for (const l of m.libraries) console.log(p.isAbsolute(l.path) ? l.path : p.resolve(root,l.path))' "${FREECAD_WASM_SDK_DIR}")
+  DEFINES+=("-DBITBYBIT_FREECAD_NAMING_LINKED=1")
+fi
+
+em++ "${SOURCES[@]}" "${INCLUDES[@]}" "${DEFINES[@]}" \
   -I"${OCCT_BUILD_DIR}/include/opencascade" \
   -I"${OCCT_SOURCE_DIR}/src" \
   -std=c++17 -O2 -fexceptions --bind \
@@ -69,6 +90,7 @@ em++ "${ROOT_DIR}/native/occt-history/occt_history.cpp" \
   "${OCCT_BUILD_DIR}/lin32/clang/lib/libTKG2d.a" \
   "${OCCT_BUILD_DIR}/lin32/clang/lib/libTKMath.a" \
   "${OCCT_BUILD_DIR}/lin32/clang/lib/libTKernel.a" \
+  "${FREECAD_LIBRARIES[@]}" \
   -Wl,--end-group \
   -sMODULARIZE=1 -sEXPORT_ES6=1 -sENVIRONMENT=web,worker,node \
   -sALLOW_MEMORY_GROWTH=1 -sINITIAL_MEMORY=134217728 -sMAXIMUM_MEMORY=2147483648 \
diff --git a/native/occt-history/freecad-wasm-sdk-manifest.example.json b/native/occt-history/freecad-wasm-sdk-manifest.example.json
new file mode 100644
index 0000000..3ce1755
--- /dev/null
+++ b/native/occt-history/freecad-wasm-sdk-manifest.example.json
@@ -0,0 +1,28 @@
+{
+  "schemaVersion": 1,
+  "freecadVersion": "1.1.1",
+  "sourceCommit": "0108fd4b4850cc46e625b60e53cea7a7bbe69f8d",
+  "emscriptenVersion": "3.1.69",
+  "qtTarget": "wasm32-emscripten",
+  "pythonTarget": "wasm32-emscripten",
+  "includeDirs": [
+    "include",
+    "include/FreeCAD"
+  ],
+  "libraries": [
+    { "name": "FreeCADBase", "path": "lib/libFreeCADBase.a", "sha256": "replace-with-64-lowercase-hex-digits" },
+    { "name": "FreeCADApp", "path": "lib/libFreeCADApp.a", "sha256": "replace-with-64-lowercase-hex-digits" },
+    { "name": "Part", "path": "lib/libPart.a", "sha256": "replace-with-64-lowercase-hex-digits" },
+    { "name": "QtCore", "path": "lib/libQt6Core.a", "sha256": "replace-with-64-lowercase-hex-digits" },
+    { "name": "Python", "path": "lib/libpython3.a", "sha256": "replace-with-64-lowercase-hex-digits" }
+  ],
+  "namingBridge": {
+    "source": "src/freecad_naming_bridge.cpp",
+    "sha256": "replace-with-64-lowercase-hex-digits",
+    "exports": [
+      "freecadNamingAbiVersion",
+      "freecadNamingCapabilitiesJson",
+      "freecadNamingEvidenceJson"
+    ]
+  }
+}
diff --git a/package.json b/package.json
index 7d5e64c..21bd069 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "test:golden:freecad:failures": "node scripts/run-freecad-golden-failures.mjs",
     "test:golden:freecad:family-failures": "node scripts/run-freecad-golden-failures.mjs --manifest=fixtures/freecad-golden/feature-families/failures/manifest.json",
     "check:occt-history-artifact": "node scripts/check-occt-history-browser-artifact.mjs",
+    "check:freecad-naming-sdk": "node scripts/check-freecad-naming-sdk.mjs",
     "test:browser-occt": "node scripts/run-browser-occt-harness.mjs",
     "test:freecad:threeway": "node scripts/run-freecad-threeway-boolean.mjs",
     "check:browser-occt": "node scripts/check-occt-browser-verification.mjs",
@@ -80,6 +81,7 @@
     "check:freecad-cam-path": "node scripts/check-freecad-cam-path-oracle.mjs",
     "test:freecad-cam-path-report": "node --test tests/freecadCamPathOracle.test.mjs",
     "build:occt-history": "bash native/occt-history/build.sh",
+    "build:freecad-naming-worker": "FREECAD_WASM_NAMING_REQUIRED=1 bash native/occt-history/build.sh",
     "test:occt-history": "node native/occt-history/smoke-test.mjs",
     "build:planegcs": "bash native/planegcs/build.sh",
     "test:planegcs": "node native/planegcs/smoke-test.mjs",
@@ -261,7 +263,7 @@
     "test:browser-matrix": "node scripts/run-browser-matrix.mjs",
     "check:browser-matrix": "node scripts/check-browser-matrix.mjs",
     "check:runtime": "node scripts/check-runtime.mjs",
-    "verify": "npm run check:runtime && npm run check:baseline && npm run check:bitbybit-history && npm run check:execution-plan && npm run check:freecad-sketcher-constraints && npm run check:freecad-inventory && npm run check:freecad-type-properties && npm run check:freecad-gui-commands && npm run check:freecad-entrypoints && npm run check:freecad-golden-fixtures && npm run check:freecad-semantic-comparator && npm run check:freecad-fcstd-roundtrip && npm run check:freecad-composite-history-elementmap && npm run check:freecad-exact-history-elementmap-gate && npm run check:freecad-native-naming-evidence && npm run check:fcstd-hardening && npm run check:occt-history-artifact && npm run check:planegcs-artifact && npm run check:browser-occt && npm run check:chrome-topology && npm run check:chrome-planegcs && npm run check:chrome-fault-injection && npm run check:chrome-opfs-migration && npm run check:chrome-persistence && npm run check:chrome-app-e2e && npm run check:chrome-partdesign-lifecycle && npm run check:pwa && npm run check:chrome-offline && npm run check:chrome-geometry-features && npm run check:chrome-native-history && npm run check:chrome-native-pad-history && npm run check:chrome-native-pocket-history && npm run check:chrome-native-loft-history && npm run check:chrome-native-pipe-history && npm run check:chrome-native-revolution-history && npm run check:chrome-native-groove-history && npm run check:chrome-native-fillet-history && npm run check:chrome-native-chamfer-history && npm run check:chrome-native-hole-history && npm run check:chrome-native-draft-history && npm run check:chrome-native-thickness-history && npm run check:chrome-native-linear-pattern-history && npm run check:chrome-native-polar-pattern-history && npm run check:chrome-native-mirrored-history && npm run check:chrome-native-multi-transform-history && npm run check:chrome-sketcher-diagnostics && npm run check:chrome-profile-validation && npm run check:chrome-sketcher-editor && npm run check:chrome-sketcher-bspline && npm run check:chrome-sketcher-stress && npm run check:chrome-part-primitives && npm run check:chrome-partdesign-transform && npm run check:chrome-partdesign-loft && npm run check:partdesign-closure && npm run check:chrome-fcstd-semantic && npm run check:chrome-fcstd-roundtrip && npm run check:fcstd-closure && npm run check:chrome-spreadsheet && npm run check:chrome-plot && npm run check:chrome-draft && npm run check:chrome-techdraw && npm run check:chrome-assembly && npm run check:chrome-mesh && npm run check:chrome-inspection && npm run check:chrome-bim && npm run check:chrome-cam && npm run check:cam-parity && npm run check:cam-pipeline && npm run check:opencamlib-wasm && npm run check:camotics-native && npm run check:camotics-gui-tpl && npm run check:camotics-wasm && npm run check:chrome-camotics-wasm && npm run check:chrome-cam-native-simulation && npm run check:chrome-cam-linuxcnc-machine && npm run check:chrome-fem && npm run check:chrome-robot && npm run check:chrome-data && npm run check:chrome-addon && npm run check:chrome-script && npm run check:chrome-surface && npm run check:chrome-qa08 && npm run check:chrome-secondary-formats && npm run check:chrome-performance && npm run check:chrome-production-document && npm run check:document-closure && npm run check:chrome-engineering && npm run check:chrome-security && npm run check:chrome-fcstd-golden && npm run check:sbom && npm run check:project-migration && npm run check:security-baseline && npm run check:dependency-audit && npm run check:freecad:threeway && npm run check:occt-upstream-drift && npm run check:facade-boundary && npm run test:golden && npm run test:spreadsheet && npm run test:plot && npm run test:draft && npm run test:techdraw && npm run test:assembly && npm run test:mesh && npm run test:inspection && npm run test:bim && npm run test:cam && npm run test:camotics-wasm && npm run test:fem && npm run test:robot && npm run test:data && npm run test:addon && npm run test:script && npm run test:surface && npm run test:locale && npm run test:secondary-formats && npm run test:performance && npm run test:production-document && npm run test:engineering && npm run test:security-preflight && npm run test:fcstd-roundtrip && npm run test:facade && npm run test:fcstd-fuzz && npm run test:geometry-input-fuzz && npm run test:sketch-solver-fuzz && npm run check:quality-closure && npm run test:planegcs && npm run test:project-migration && npm run test:sketcher-stress && npm run test:topology-replay && npm run build && npm run check:built-pwa && npm run generate:release-artifacts && npm run check:release-artifacts && npm run check:release-closure && npm run test:release-signature",
+    "verify": "npm run check:runtime && npm run check:baseline && npm run check:bitbybit-history && npm run check:execution-plan && npm run check:freecad-sketcher-constraints && npm run check:freecad-inventory && npm run check:freecad-type-properties && npm run check:freecad-gui-commands && npm run check:freecad-entrypoints && npm run check:freecad-golden-fixtures && npm run check:freecad-semantic-comparator && npm run check:freecad-fcstd-roundtrip && npm run check:freecad-composite-history-elementmap && npm run check:freecad-exact-history-elementmap-gate && npm run check:freecad-native-naming-evidence && npm run check:fcstd-hardening && npm run check:freecad-naming-sdk && npm run check:occt-history-artifact && npm run check:planegcs-artifact && npm run check:browser-occt && npm run check:chrome-topology && npm run check:chrome-planegcs && npm run check:chrome-fault-injection && npm run check:chrome-opfs-migration && npm run check:chrome-persistence && npm run check:chrome-app-e2e && npm run check:chrome-partdesign-lifecycle && npm run check:pwa && npm run check:chrome-offline && npm run check:chrome-geometry-features && npm run check:chrome-native-history && npm run check:chrome-native-pad-history && npm run check:chrome-native-pocket-history && npm run check:chrome-native-loft-history && npm run check:chrome-native-pipe-history && npm run check:chrome-native-revolution-history && npm run check:chrome-native-groove-history && npm run check:chrome-native-fillet-history && npm run check:chrome-native-chamfer-history && npm run check:chrome-native-hole-history && npm run check:chrome-native-draft-history && npm run check:chrome-native-thickness-history && npm run check:chrome-native-linear-pattern-history && npm run check:chrome-native-polar-pattern-history && npm run check:chrome-native-mirrored-history && npm run check:chrome-native-multi-transform-history && npm run check:chrome-sketcher-diagnostics && npm run check:chrome-profile-validation && npm run check:chrome-sketcher-editor && npm run check:chrome-sketcher-bspline && npm run check:chrome-sketcher-stress && npm run check:chrome-part-primitives && npm run check:chrome-partdesign-transform && npm run check:chrome-partdesign-loft && npm run check:partdesign-closure && npm run check:chrome-fcstd-semantic && npm run check:chrome-fcstd-roundtrip && npm run check:fcstd-closure && npm run check:chrome-spreadsheet && npm run check:chrome-plot && npm run check:chrome-draft && npm run check:chrome-techdraw && npm run check:chrome-assembly && npm run check:chrome-mesh && npm run check:chrome-inspection && npm run check:chrome-bim && npm run check:chrome-cam && npm run check:cam-parity && npm run check:cam-pipeline && npm run check:opencamlib-wasm && npm run check:camotics-native && npm run check:camotics-gui-tpl && npm run check:camotics-wasm && npm run check:chrome-camotics-wasm && npm run check:chrome-cam-native-simulation && npm run check:chrome-cam-linuxcnc-machine && npm run check:chrome-fem && npm run check:chrome-robot && npm run check:chrome-data && npm run check:chrome-addon && npm run check:chrome-script && npm run check:chrome-surface && npm run check:chrome-qa08 && npm run check:chrome-secondary-formats && npm run check:chrome-performance && npm run check:chrome-production-document && npm run check:document-closure && npm run check:chrome-engineering && npm run check:chrome-security && npm run check:chrome-fcstd-golden && npm run check:sbom && npm run check:project-migration && npm run check:security-baseline && npm run check:dependency-audit && npm run check:freecad:threeway && npm run check:occt-upstream-drift && npm run check:facade-boundary && npm run test:golden && npm run test:spreadsheet && npm run test:plot && npm run test:draft && npm run test:techdraw && npm run test:assembly && npm run test:mesh && npm run test:inspection && npm run test:bim && npm run test:cam && npm run test:camotics-wasm && npm run test:fem && npm run test:robot && npm run test:data && npm run test:addon && npm run test:script && npm run test:surface && npm run test:locale && npm run test:secondary-formats && npm run test:performance && npm run test:production-document && npm run test:engineering && npm run test:security-preflight && npm run test:fcstd-roundtrip && npm run test:facade && npm run test:fcstd-fuzz && npm run test:geometry-input-fuzz && npm run test:sketch-solver-fuzz && npm run check:quality-closure && npm run test:planegcs && npm run test:project-migration && npm run test:sketcher-stress && npm run test:topology-replay && npm run build && npm run check:built-pwa && npm run generate:release-artifacts && npm run check:release-artifacts && npm run check:release-closure && npm run test:release-signature",
     "test:chrome-native-thickness-history": "node scripts/run-chrome-native-thickness-history.mjs",
     "check:chrome-native-thickness-history": "node scripts/check-chrome-native-thickness-history.mjs",
     "test:chrome-native-linear-pattern-history": "node scripts/run-chrome-native-linear-pattern-history.mjs",
diff --git a/public/chrome-opfs-migration-harness.html b/public/chrome-opfs-migration-harness.html
index 20d2964..09431e7 100644
--- a/public/chrome-opfs-migration-harness.html
+++ b/public/chrome-opfs-migration-harness.html
@@ -54,7 +54,7 @@ try {
   const loaded = await persistence.load(documentId)
   const restoredResource = await persistence.resource.get(resourceHash)
   const recovery = await persistence.recovery(documentId)
-  const migratedDocument = loaded ? { ...loaded, version: loaded.version + 1, dirty: false, label: 'Migrated OPFS project' } : null
+  const migratedDocument = loaded ? { ...loaded, version: loaded.version + 1, dirty: false, label: 'Migrated OPFS project', objects: loaded.objects.map((object, index) => ({ ...object, nativeObjectTag: 17 + index })) } : null
   if (!migratedDocument) throw new Error('Legacy document did not load after migration.')
   await persistence.save(migratedDocument)
   await persistence.dispose()
@@ -73,9 +73,12 @@ try {
     migratedDocumentVersion: loaded?.version ?? null,
     migratedLabel: loaded?.label ?? null,
     migratedObjectCount: loaded?.objects.length ?? 0,
+    migratedNativeObjectTag: loaded?.objects[0]?.nativeObjectTag ?? null,
     recomputeDefaulted: loaded?.recompute?.status === 'idle',
     reopenedSchemaVersion: reopenedCapabilities.schemaVersion,
     reopenedVersion: reopenedDocument?.version ?? null,
+    reopenedNativeObjectTag: reopenedDocument?.objects[0]?.nativeObjectTag ?? null,
+    checkpointNativeObjectTag: checkpoint?.objects[0]?.nativeObjectTag ?? null,
     reopenedLabel: reopenedDocument?.label ?? null,
     checkpointVersion: checkpoint?.version ?? null,
     recoveryIntegrity: recovery.integrity,
@@ -85,7 +88,7 @@ try {
   }
   report.rollback = { rejected: rollbackError.includes('interruption after schema version 3'), interruptedAfterMarker: rollbackError.includes('interruption after schema version 3'), error: rollbackError, appliedVersionsAfterFailure: afterRollback.appliedVersions || [] }
   report.cleanup = { databasePath, removedFiles: [] }
-  report.status = report.crossOriginIsolated && migrated.mode === 'sqlite-opfs' && migrated.schemaVersion === 6 && report.rollback.rejected && report.rollback.interruptedAfterMarker && report.rollback.appliedVersionsAfterFailure.length === 1 && report.rollback.appliedVersionsAfterFailure[0] === 1 && report.migration.migratedDocumentVersion === 3 && report.migration.migratedObjectCount === 1 && report.migration.recomputeDefaulted && report.migration.reopenedSchemaVersion === 6 && report.migration.reopenedVersion === 4 && report.migration.checkpointVersion === 4 && report.migration.recoveryIntegrity === 'ok' && report.migration.reopenedRecoveryIntegrity === 'ok' && report.migration.resourceRoundTrip && report.migration.resourceReleased ? 'pass' : 'failed'
+  report.status = report.crossOriginIsolated && migrated.mode === 'sqlite-opfs' && migrated.schemaVersion === 7 && report.rollback.rejected && report.rollback.interruptedAfterMarker && report.rollback.appliedVersionsAfterFailure.length === 1 && report.rollback.appliedVersionsAfterFailure[0] === 1 && report.migration.migratedDocumentVersion === 3 && report.migration.migratedObjectCount === 1 && report.migration.migratedNativeObjectTag === 1 && report.migration.recomputeDefaulted && report.migration.reopenedSchemaVersion === 7 && report.migration.reopenedVersion === 4 && report.migration.reopenedNativeObjectTag === 17 && report.migration.checkpointNativeObjectTag === 17 && report.migration.checkpointVersion === 4 && report.migration.recoveryIntegrity === 'ok' && report.migration.reopenedRecoveryIntegrity === 'ok' && report.migration.resourceRoundTrip && report.migration.resourceReleased ? 'pass' : 'failed'
 } catch (error) {
   report.status = 'failed'
   report.error = error instanceof Error ? `${error.name}: ${error.message}` : String(error)
diff --git a/scripts/check-chrome-opfs-migration.mjs b/scripts/check-chrome-opfs-migration.mjs
index f4a0af2..f011714 100644
--- a/scripts/check-chrome-opfs-migration.mjs
+++ b/scripts/check-chrome-opfs-migration.mjs
@@ -5,7 +5,7 @@ const root = resolve(new URL('..', import.meta.url).pathname)
 const report = JSON.parse(await readFile(resolve(root, 'config/chrome-opfs-migration-verification.json'), 'utf8'))
 if (report.schemaVersion !== 1 || report.browserId !== 'chrome' || report.status !== 'pass' || report.crossOriginIsolated !== true) throw new Error('Chrome REL-02 OPFS migration evidence is not passing.')
 const migration = report.migration
-if (!migration || migration.sourceSchemaVersion !== 1 || migration.migratedSchemaVersion !== 6 || migration.migratedDocumentVersion !== 3 || migration.migratedObjectCount !== 1 || migration.recomputeDefaulted !== true || migration.reopenedSchemaVersion !== 6 || migration.reopenedVersion !== 4 || migration.checkpointVersion !== 4 || migration.recoveryIntegrity !== 'ok' || migration.reopenedRecoveryIntegrity !== 'ok' || migration.resourceRoundTrip !== true || migration.resourceReleased !== true) throw new Error('Chrome REL-02 forward migration, reopen, checkpoint, or resource evidence is invalid.')
+if (!migration || migration.sourceSchemaVersion !== 1 || migration.migratedSchemaVersion !== 7 || migration.migratedDocumentVersion !== 3 || migration.migratedObjectCount !== 1 || migration.migratedNativeObjectTag !== 1 || migration.recomputeDefaulted !== true || migration.reopenedSchemaVersion !== 7 || migration.reopenedVersion !== 4 || migration.reopenedNativeObjectTag !== 17 || migration.checkpointNativeObjectTag !== 17 || migration.checkpointVersion !== 4 || migration.recoveryIntegrity !== 'ok' || migration.reopenedRecoveryIntegrity !== 'ok' || migration.resourceRoundTrip !== true || migration.resourceReleased !== true) throw new Error('Chrome REL-02 forward migration, native object tag, reopen, checkpoint, or resource evidence is invalid.')
 if (!report.rollback || report.rollback.rejected !== true || report.rollback.interruptedAfterMarker !== true || !/interruption after schema version 3/.test(report.rollback.error || '') || JSON.stringify(report.rollback.appliedVersionsAfterFailure) !== '[1]') throw new Error('Chrome REL-02 SQLite interruption rollback evidence is invalid.')
 if (!report.cleanup || !Array.isArray(report.cleanup.removedFiles) || report.cleanup.removedFiles.length === 0 || report.cleanup.removedFiles.some((name) => typeof name !== 'string' || !name.startsWith(report.cleanup.databasePath.slice(1)))) throw new Error('Chrome REL-02 OPFS database cleanup evidence is invalid.')
 console.log(JSON.stringify({ status: 'chrome-opfs-migration-pass', browserId: report.browserId, migration, cleanup: report.cleanup }, null, 2))
diff --git a/scripts/check-freecad-naming-sdk.mjs b/scripts/check-freecad-naming-sdk.mjs
new file mode 100644
index 0000000..ef7d232
--- /dev/null
+++ b/scripts/check-freecad-naming-sdk.mjs
@@ -0,0 +1,60 @@
+import { access, readFile } from 'node:fs/promises'
+import { createHash } from 'node:crypto'
+import { resolve, isAbsolute } from 'node:path'
+
+const root = resolve(new URL('..', import.meta.url).pathname)
+const sdkRoot = process.env.FREECAD_WASM_SDK_DIR ? resolve(root, process.env.FREECAD_WASM_SDK_DIR) : ''
+const required = (value, name) => {
+  if (typeof value !== 'string' || !value.trim()) throw new Error(`FreeCAD WASM SDK manifest requires ${name}.`)
+  return value.trim()
+}
+const exists = async (path) => access(path).then(() => true).catch(() => false)
+const sha256 = async (path) => createHash('sha256').update(await readFile(path)).digest('hex')
+const fail = (message) => { throw new Error(`FreeCAD WASM naming SDK: ${message}`) }
+
+if (!sdkRoot) {
+  console.log(JSON.stringify({ status: 'sdk-not-configured', availability: 'unavailable', systemExact: false, reason: 'FREECAD_WASM_SDK_DIR is not configured; the shipped Worker remains OCCT-only.' }, null, 2))
+  process.exit(0)
+}
+
+const manifestPath = resolve(sdkRoot, 'manifest.json')
+if (!await exists(manifestPath)) fail(`missing manifest: ${manifestPath}`)
+let manifest
+try { manifest = JSON.parse(await readFile(manifestPath, 'utf8')) } catch (error) { fail(`manifest is not valid JSON: ${error instanceof Error ? error.message : String(error)}`) }
+if (manifest.schemaVersion !== 1) fail(`unsupported manifest schema ${String(manifest.schemaVersion)}.`)
+if (required(manifest.freecadVersion, 'freecadVersion') !== '1.1.1') fail('freecadVersion must be 1.1.1.')
+if (required(manifest.sourceCommit, 'sourceCommit') !== '0108fd4b4850cc46e625b60e53cea7a7bbe69f8d') fail('sourceCommit is not the locked FreeCAD commit.')
+if (required(manifest.emscriptenVersion, 'emscriptenVersion') !== '3.1.69') fail('emscriptenVersion must be 3.1.69.')
+if (required(manifest.qtTarget, 'qtTarget') !== 'wasm32-emscripten' || required(manifest.pythonTarget, 'pythonTarget') !== 'wasm32-emscripten') fail('Qt and Python must both be wasm32-emscripten targets.')
+const includeDirs = Array.isArray(manifest.includeDirs) ? manifest.includeDirs : fail('includeDirs must be an array.')
+const resolvedIncludeDirs = includeDirs.map((includeDir) => isAbsolute(includeDir) ? includeDir : resolve(sdkRoot, includeDir))
+const libraries = Array.isArray(manifest.libraries) ? manifest.libraries : fail('libraries must be an array.')
+const libraryNames = new Set(libraries.map((library) => library?.name))
+for (const name of ['FreeCADBase', 'FreeCADApp', 'Part', 'QtCore', 'Python']) if (!libraryNames.has(name)) fail(`libraries must include ${name}.`)
+const namingBridge = manifest.namingBridge && typeof manifest.namingBridge === 'object' ? manifest.namingBridge : fail('namingBridge is required.')
+const bridgePath = required(namingBridge.source, 'namingBridge.source')
+const bridge = isAbsolute(bridgePath) ? bridgePath : resolve(sdkRoot, bridgePath)
+if (!await exists(bridge)) fail(`missing naming bridge source: ${bridge}`)
+if (!Array.isArray(namingBridge.exports) || !['freecadNamingAbiVersion', 'freecadNamingCapabilitiesJson', 'freecadNamingEvidenceJson'].every((name) => namingBridge.exports.includes(name))) fail('namingBridge.exports must declare all three versioned ABI callbacks.')
+for (const path of resolvedIncludeDirs) {
+  if (!await exists(path)) fail(`missing include directory: ${path}`)
+}
+for (const library of libraries) {
+  if (!library || typeof library !== 'object') fail('libraries entries must be objects.')
+  const name = required(library.name, 'libraries[].name')
+  const pathValue = required(library.path, `libraries[${name}].path`)
+  const path = isAbsolute(pathValue) ? pathValue : resolve(sdkRoot, pathValue)
+  if (!path.endsWith('.a')) fail(`library ${name} must be a static .a archive.`)
+  if (!await exists(path)) fail(`missing static library ${name}: ${path}`)
+  if ((await readFile(path)).byteLength === 0) fail(`static library ${name} is empty.`)
+  if (typeof library.sha256 !== 'string' || !/^[a-f0-9]{64}$/.test(library.sha256)) fail(`library ${name} requires a lowercase SHA-256.`)
+  const actualHash = await sha256(path)
+  if (actualHash !== library.sha256) fail(`library ${name} hash mismatch: expected ${library.sha256}, got ${actualHash}.`)
+}
+for (const header of ['App/StringHasher.h', 'App/MappedName.h', 'App/ElementMap.h']) {
+  if (!(await Promise.all(resolvedIncludeDirs.map((includeDir) => exists(resolve(includeDir, header))))).some(Boolean)) fail(`missing locked FreeCAD private header in includeDirs: ${header}`)
+}
+const bridgeSha = await sha256(bridge)
+if (typeof namingBridge.sha256 !== 'string' || !/^[a-f0-9]{64}$/.test(namingBridge.sha256)) fail('namingBridge.sha256 requires a lowercase SHA-256.')
+if (namingBridge.sha256 !== bridgeSha) fail(`naming bridge hash mismatch: expected ${namingBridge.sha256}, got ${bridgeSha}.`)
+console.log(JSON.stringify({ status: 'sdk-ready', availability: 'available', systemExact: false, sdkRoot, freecadVersion: manifest.freecadVersion, sourceCommit: manifest.sourceCommit, emscriptenVersion: manifest.emscriptenVersion, includeDirs, libraries: libraries.map(({ name, path, sha256 }) => ({ name, path, sha256 })), namingBridge: { source: bridgePath, sha256: bridgeSha, exports: [...namingBridge.exports] } }, null, 2))
diff --git a/scripts/check-occt-history-browser-artifact.mjs b/scripts/check-occt-history-browser-artifact.mjs
index b5e9034..7929d4f 100644
--- a/scripts/check-occt-history-browser-artifact.mjs
+++ b/scripts/check-occt-history-browser-artifact.mjs
@@ -1,6 +1,7 @@
 import { createHash } from 'node:crypto'
 import { access, readFile } from 'node:fs/promises'
 import { resolve } from 'node:path'
+import { pathToFileURL } from 'node:url'
 
 const root = resolve(new URL('..', import.meta.url).pathname)
 const artifactNames = ['bitbybit-occt-history.js', 'bitbybit-occt-history.wasm']
@@ -27,4 +28,56 @@ const workerClient = await readFile(resolve(root, 'src/facade/nativeHistoryWorke
 if (!workerClient.includes("'/native/occt-history/bitbybit-occt-history.js'")) throw new Error('Native history Worker client URL does not match the published artifact.')
 const files = []
 for (const name of artifactNames) files.push({ name, sha256: hash(await readFile(resolve(publicRoot, name))) })
-console.log(JSON.stringify({ status: 'artifact-pass', files }, null, 2))
+let namingAbi = { availability: 'unavailable', callbacks: [] }
+const factoryModule = await import(pathToFileURL(resolve(distRoot, 'bitbybit-occt-history.js')).href)
+const factory = factoryModule.default
+if (typeof factory !== 'function') throw new TypeError('OCCT history artifact default export is not a factory.')
+const nativeModule = await factory({ locateFile: (fileName) => resolve(distRoot, fileName.split('/').at(-1)) })
+const callbacks = ['freecadNamingAbiVersion', 'freecadNamingCapabilitiesJson', 'freecadNamingEvidenceJson'].filter((name) => typeof nativeModule[name] === 'function')
+if (callbacks.length !== 0 && callbacks.length !== 3) throw new Error(`FreeCAD naming ABI is partially exported: ${callbacks.join(', ')}.`)
+if (callbacks.length === 3) {
+  const abiVersion = nativeModule.freecadNamingAbiVersion()
+  const descriptor = JSON.parse(nativeModule.freecadNamingCapabilitiesJson())
+  if (abiVersion !== 1 || descriptor.schemaVersion !== 1 || descriptor.freecadVersion !== '1.1.1' || descriptor.sourceCommit !== '0108fd4b4850cc46e625b60e53cea7a7bbe69f8d' || descriptor.mappedNameRef !== true || descriptor.stringHasher !== true || descriptor.elementMap2 !== true || !Array.isArray(descriptor.operations) || !descriptor.operations.includes('cut')) throw new Error('FreeCAD naming ABI descriptor is not the locked v1 contract with Cut support.')
+  let object
+  let tool
+  let evidence
+  try {
+    object = nativeModule.makeBox(10, 10, 10)
+    tool = nativeModule.makeBox(5, 5, 5)
+    const objectStep = nativeModule.shapeToStep(object)
+    const toolStep = nativeModule.shapeToStep(tool)
+    const history = nativeModule.booleanHistoryFromStep(objectStep, toolStep, 'cut')
+    const request = {
+      schemaVersion: 1,
+      requestId: 'artifact-private-naming-probe',
+      documentId: 'artifact-probe-document',
+      documentVersion: 1,
+      operationId: 'artifact-probe-cut',
+      operation: 'cut',
+      stageId: 'artifact-probe:stage:0',
+      resultObjectId: 'artifact-probe:result',
+      resultObjectTag: 3,
+      inputs: [
+        { inputId: 'object', objectId: 'artifact-probe:object', role: 'object', step: objectStep, objectTag: 1 },
+        { inputId: 'tool', objectId: 'artifact-probe:tool', role: 'tool', step: toolStep, objectTag: 2 },
+      ],
+      stages: [{ stageId: 'artifact-probe:stage:0', operation: 'cut', inputIds: ['object', 'tool'], ordinal: 0 }],
+      resultStep: history.resultStep,
+      resultBrep: history.resultBrep,
+      history,
+    }
+    evidence = JSON.parse(nativeModule.freecadNamingEvidenceJson(JSON.stringify(request)))
+  } finally {
+    object?.delete?.()
+    tool?.delete?.()
+  }
+  if (!evidence || evidence.schemaVersion !== 1 || evidence.stageId !== 'artifact-probe:stage:0' || evidence.resultObjectId !== 'artifact-probe:result' || !['native-evidence', 'ambiguous'].includes(evidence.status) || !Array.isArray(evidence.mappedNames) || evidence.mappedNames.length === 0 || !evidence.stringHasher || !evidence.elementMap2) throw new Error('FreeCAD naming ABI did not return complete stage-bound Cut evidence.')
+  namingAbi = { availability: 'available', callbacks, abiVersion, descriptor, evidenceProbe: { operation: 'cut', status: evidence.status, mappedNames: evidence.mappedNames.length, stringHasher: true, elementMap2: true } }
+}
+const abiContract = JSON.parse(await readFile(resolve(root, 'config/freecad-sketcher-partdesign-abi-contract.json'), 'utf8'))
+const expectedImplementation = abiContract.privateNamingAbi?.shippedWorkerImplementation
+if (expectedImplementation === 'not-linked' && namingAbi.availability !== 'unavailable') throw new Error('OCCT history artifact exports FreeCAD naming callbacks but the shipped-worker contract still says not-linked.')
+if (expectedImplementation === 'freecad-linked' && namingAbi.availability !== 'available') throw new Error('Shipped-worker contract claims FreeCAD linkage but the artifact ABI probe is unavailable.')
+if (!['not-linked', 'freecad-linked'].includes(expectedImplementation)) throw new Error('Shipped-worker FreeCAD naming implementation status is invalid.')
+console.log(JSON.stringify({ status: 'artifact-pass', files, namingAbi, exactBoundary: namingAbi.availability === 'available' ? 'probe-only; FreeCAD evidence still requires locked descriptor and response validation' : 'occt-only; EX-TSN-02 remains in_progress and systemExact=false' }, null, 2))
diff --git a/scripts/check-quality-closure.mjs b/scripts/check-quality-closure.mjs
index a32f00c..27bf9a4 100644
--- a/scripts/check-quality-closure.mjs
+++ b/scripts/check-quality-closure.mjs
@@ -59,7 +59,7 @@ if (sketchFuzz.status !== 'sketch-solver-fuzz-pass' || sketchFuzz.models !== 200
 
 if (performance.status !== 'pass' || performance.benchmark?.objects !== 1000 || performance.benchmark.triangles !== 1_000_000 || performance.benchmark.tableCells !== 100_000 || performance.benchmark.pass !== true || performance.afterRelease?.shapeCount !== 0) throw new Error('QA-05 performance and ownership evidence is incomplete.')
 if (fault.status !== 'pass' || fault.lifecycle?.completed !== 'completed' || fault.lifecycle.cancelled !== 'cancelled' || fault.lifecycle.crashInjected !== true || fault.lifecycle.recovered !== 'completed' || fault.lifecycle.stale !== 'stale' || fault.opfs?.markerRemoved !== true) throw new Error('QA-06 Worker/WASM fault evidence is incomplete.')
-if (opfsMigration.status !== 'pass' || opfsMigration.migration?.migratedSchemaVersion !== 6 || opfsMigration.migration.recoveryIntegrity !== 'ok' || opfsMigration.rollback?.rejected !== true) throw new Error('QA-06 OPFS recovery evidence is incomplete.')
+if (opfsMigration.status !== 'pass' || opfsMigration.migration?.migratedSchemaVersion !== 7 || opfsMigration.migration.reopenedNativeObjectTag !== 17 || opfsMigration.migration.recoveryIntegrity !== 'ok' || opfsMigration.rollback?.rejected !== true) throw new Error('QA-06 OPFS recovery evidence is incomplete.')
 if (security.status !== 'pass' || security.checks?.rejectedCases !== 4 || security.checks.pass !== true || addon.security?.forgedRejected !== true || addon.security.permissionRejected !== true || script.security?.noDynamicExecution !== true || script.security.deniedCapabilities?.length !== 4) throw new Error('QA-07 security evidence is incomplete.')
 if (qa08.status !== 'pass' || qa08.locales?.supported !== 3 || qa08.accessibility?.pass !== true || app.keyboard?.named !== 8 || app.screenReader?.namedControls !== app.screenReader?.controls || app.screenReader?.unnamedControls !== 0 || app.mobile?.bodyHorizontalOverflow > 1) throw new Error('QA-08 accessibility/i18n evidence is incomplete.')
 
diff --git a/scripts/check-release-closure.mjs b/scripts/check-release-closure.mjs
index ae2f085..1a58c9b 100644
--- a/scripts/check-release-closure.mjs
+++ b/scripts/check-release-closure.mjs
@@ -30,6 +30,6 @@ await access(resolve(root, 'docs/release-runbook.zh-CN.md')).catch(() => fail('r
 if (release.schemaVersion !== 1 || release.signature?.status !== 'signed' || release.signature.algorithm !== 'Ed25519' || !release.signature.keyId || !/^[0-9a-f]{64}$/.test(release.signature.payloadSha256 || '') || release.build?.files?.length === 0) fail('release artifact manifest is not signed and complete.')
 if (sbom.bomFormat !== 'CycloneDX' || sbom.components?.length !== audit.metadata?.dependencies?.total) fail('SBOM is missing, stale, or inconsistent with the locked audit inventory.')
 if (offline.status !== 'pass' || offline.serviceWorker?.offlineFallback !== true || offline.serviceWorker?.staleCacheRemoved !== true) fail('offline deployment evidence is incomplete.')
-if (migration.status !== 'pass' || migration.currentSchemaVersion !== 6 || migration.forward?.length !== 6 || migration.rollback?.length !== 6) fail('migration/rollback evidence is incomplete.')
+if (migration.status !== 'pass' || migration.currentSchemaVersion !== 7 || migration.forward?.length !== 7 || migration.rollback?.length !== 7) fail('migration/rollback evidence is incomplete.')
 if (performance.status !== 'pass' || performance.benchmark?.pass !== true || security.status !== 'pass' || security.checks?.pass !== true || quality.status !== 'quality-closure-pass') fail('quality evidence is incomplete.')
 console.log(JSON.stringify({ status: 'release-closure-pass', gates: matrix.gates.length, modules: coverage.modules.length, moduleCounts: matrix.moduleCounts, signed: true, sbomComponents: sbom.components.length, migrationVersions: migration.currentSchemaVersion }, null, 2))
diff --git a/src/facade/fcstd.ts b/src/facade/fcstd.ts
index cbdeda2..64b4532 100644
--- a/src/facade/fcstd.ts
+++ b/src/facade/fcstd.ts
@@ -52,6 +52,7 @@ export type FcstdObjectSummary = {
   name: string
   label: string
   typeId: string
+  nativeObjectTag?: number
   propertyCount: number
   properties: FcstdPropertySummary[]
   support: FcstdObjectSupport
@@ -1103,16 +1104,32 @@ export const serializeFcstdMetadataArchive = (document: DocumentSnapshot, option
   const objectIds = document.objects.map((object) => object.id.trim())
   if (objectIds.some((objectId) => !objectId)) throw new TypeError('FCStd metadata writer requires non-empty object ids.')
   if (new Set(objectIds).size !== objectIds.length) throw new TypeError('FCStd metadata writer requires unique object ids.')
+  const explicitObjectTags = new Set<number>()
+  for (const object of document.objects) {
+    if (object.nativeObjectTag === undefined) continue
+    if (!Number.isSafeInteger(object.nativeObjectTag) || object.nativeObjectTag <= 0) throw new RangeError(`FCStd object ${object.id} nativeObjectTag must be a positive safe integer.`)
+    if (explicitObjectTags.has(object.nativeObjectTag)) throw new RangeError(`FCStd nativeObjectTag ${object.nativeObjectTag} is assigned to more than one object.`)
+    explicitObjectTags.add(object.nativeObjectTag)
+  }
+  let nextObjectTag = 1
+  const objectTags = new Map(document.objects.map((object) => {
+    if (object.nativeObjectTag !== undefined) return [object.id, object.nativeObjectTag] as const
+    while (explicitObjectTags.has(nextObjectTag)) nextObjectTag += 1
+    const tag = nextObjectTag
+    explicitObjectTags.add(tag)
+    nextObjectTag += 1
+    return [object.id, tag] as const
+  }))
   const objectIdSet = new Set(objectIds)
   const dependencies = new Map(objectIds.map((objectId) => [objectId, [] as string[]]))
   for (const edge of document.dependencies ?? []) {
     if (!objectIdSet.has(edge.sourceId) || !objectIdSet.has(edge.targetId)) throw new Error(`FCStd dependency ${edge.sourceId} -> ${edge.targetId} references an undeclared object.`)
     if (edge.relation !== 'view') dependencies.get(edge.sourceId)?.push(edge.targetId)
   }
-  const objectDeclarations = document.objects.map((object, objectIndex) => {
+  const objectDeclarations = document.objects.map((object) => {
     const targets = dependencies.get(object.id) ?? []
     const dependencyXml = targets.length === 0 ? `<ObjectDeps Name="${xmlEscape(object.id)}" Count="0"/>` : `<ObjectDeps Name="${xmlEscape(object.id)}" Count="${targets.length}">${targets.map((target) => `<Dep Name="${xmlEscape(target)}"/>`).join('')}</ObjectDeps>`
-    return `${dependencyXml}<Object name="${xmlEscape(object.id)}" type="${xmlEscape(nativeFcstdTypeId(object.typeId))}" id="${objectIndex + 1}" Touched="1"/>`
+    return `${dependencyXml}<Object name="${xmlEscape(object.id)}" type="${xmlEscape(nativeFcstdTypeId(object.typeId))}" id="${objectTags.get(object.id)}" Touched="1"/>`
   }).join('')
   const objectData = document.objects.map((object) => {
     const sketchGeneratedPropertyNames = object.sketch ? new Set(['Geometry', 'Constraints', 'ExternalGeo', 'ExternalGeometry', 'ExternalTypes', 'WebGeometryIds', 'WebSyntheticConstraintIds', 'WebExternalIds', 'WebExternalProjectionIds', 'WebExternalSources']) : new Set<string>()
@@ -2014,9 +2031,18 @@ const parseDocumentXml = (bytes: Uint8Array, limits: FcstdArchiveLimits) => {
   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 nativeObjectTags = new Set<number>()
   const objects = objectDeclarations.map((declaration): FcstdObjectSummary => {
     const name = attribute(declaration, 'name') || '<unnamed>'
     const typeId = attribute(declaration, 'type') || 'App::DocumentObject'
+    const objectTagText = attribute(declaration, 'id')
+    let nativeObjectTag: number | undefined
+    if (objectTagText) {
+      if (!/^\d+$/.test(objectTagText) || !Number.isSafeInteger(Number(objectTagText)) || Number(objectTagText) <= 0) throw new Error(`FCStd object ${name} has an invalid native id.`)
+      nativeObjectTag = Number(objectTagText)
+      if (nativeObjectTags.has(nativeObjectTag)) throw new Error(`FCStd object native id ${nativeObjectTag} is duplicated.`)
+      nativeObjectTags.add(nativeObjectTag)
+    }
     const data = dataByName.get(name)
     const propertiesContainer = data?.Properties as Record<string, unknown> | undefined
     const properties = asArray(((propertiesContainer?.Property) as Record<string, unknown> | Record<string, unknown>[] | undefined))
@@ -2029,7 +2055,7 @@ const parseDocumentXml = (bytes: Uint8Array, limits: FcstdArchiveLimits) => {
     const support: FcstdObjectSupport = blockedTypeId(typeId) ? 'blocked' : recognizedTypeIds.has(typeId) ? 'recognized' : 'proxy'
     const summaries = propertySummaries(properties).map((property) => expressions.has(property.name) ? { ...property, expression: expressions.get(property.name) } : property)
     const sketch = typeId === 'Sketcher::SketchObject' ? sketchFromPropertySummaries(name, summaries) : undefined
-    return { name, label: objectLabelProperty ? propertyValue(objectLabelProperty) || name : name, typeId, propertyCount: properties.length, properties: summaries, support, extensions, ...(sketch ? { sketch } : {}) }
+    return { name, label: objectLabelProperty ? propertyValue(objectLabelProperty) || name : name, typeId, ...(nativeObjectTag === undefined ? {} : { nativeObjectTag }), propertyCount: properties.length, properties: summaries, support, extensions, ...(sketch ? { sketch } : {}) }
   })
   return {
     schemaVersion: attribute(root, 'SchemaVersion') || attribute(root, 'schemaVersion') || 'unknown',
@@ -2348,6 +2374,7 @@ const createProxyDocument = (inspection: Omit<FcstdInspection, 'proxyDocument'>)
     return {
       id: object.name,
       typeId: object.typeId,
+      ...(object.nativeObjectTag === undefined ? {} : { nativeObjectTag: object.nativeObjectTag }),
       properties: [
       createProxyProperty('Label', 'Label', object.label),
       createProxyProperty('TypeId', 'Type', object.typeId),
diff --git a/src/facade/geometryRuntime.ts b/src/facade/geometryRuntime.ts
index be670d0..fbabf4a 100644
--- a/src/facade/geometryRuntime.ts
+++ b/src/facade/geometryRuntime.ts
@@ -1324,9 +1324,12 @@ export class BitbybitGeometryRuntime {
     const stageTransport = input.stages?.length ? {
       inputs: input.inputs.map((source, index) => ({
         inputId: source.inputId ?? `${input.operationId}:input:${index}`,
+        objectId: source.objectId,
         role: source.role,
         stageId: source.stageId,
         step: stepByObjectId.get(source.objectId)!.text,
+        objectTag: source.objectTag,
+        namingEvidence: source.namingEvidence,
       })),
       stages: input.stages.map((stage) => ({
         stageId: stage.stageId,
@@ -1339,12 +1342,12 @@ export class BitbybitGeometryRuntime {
         ordinal: stage.ordinal,
       })),
     } : {}
-    const captureHistory = (request: Parameters<NativeOcctHistoryCoordinator['capture']>[1]) => nativeHistory.coordinator.capture(nativeHistory.provider, { ...request, ...stageTransport })
-    const mapHistoryRecords = (response: Parameters<typeof mapNativeOcctHistoryRecords>[0], sourceIds: { object: string; tool: string } | Record<string, string>) => mapNativeOcctHistoryRecords(response, sourceIds, input)
-    type NativeStageRequest = Pick<NativeOcctHistoryRequest, 'objectStep'> & Partial<Pick<NativeOcctHistoryRequest, 'toolStep' | 'direction' | 'axisOrigin' | 'angle'>>
     const finalResultObjectId = () => input.stages?.length
       ? input.stages[input.stages.length - 1].resultObjectId ?? `${input.operationId}:result`
       : `${input.operationId}:result`
+    const captureHistory = (request: Parameters<NativeOcctHistoryCoordinator['capture']>[1]) => nativeHistory.coordinator.capture(nativeHistory.provider, { ...request, ...stageTransport, resultObjectId: finalResultObjectId(), resultObjectTag: input.resultObjectTag })
+    const mapHistoryRecords = (response: Parameters<typeof mapNativeOcctHistoryRecords>[0], sourceIds: { object: string; tool: string } | Record<string, string>) => mapNativeOcctHistoryRecords(response, sourceIds, input)
+    type NativeStageRequest = Pick<NativeOcctHistoryRequest, 'objectStep'> & Partial<Pick<NativeOcctHistoryRequest, 'toolStep' | 'direction' | 'axisOrigin' | 'angle'>>
     const namingEvidenceForResponse = (response: NativeOcctHistoryResponse, stageId: string, resultObjectId: string) => response.namingEvidence
       ? assertNativeNamingEvidence({ ...response.namingEvidence, stageId, resultObjectId })
       : createFinalShapeOnlyNamingEvidence(stageId, resultObjectId)
@@ -1358,11 +1361,24 @@ export class BitbybitGeometryRuntime {
       inputs: NativeTopologyHistoryInput['inputs']
       request: NativeStageRequest
     }) => {
+      const transportInputs = stage.inputs.map((source, index) => ({
+        inputId: `${stage.stageId}:input:${index}`,
+        objectId: source.objectId,
+        role: index === 0 ? 'object' : 'tool',
+        stageId: source.stageId,
+        step: index === 0 ? stage.request.objectStep : stage.request.toolStep ?? stage.request.objectStep,
+        objectTag: source.objectTag,
+        namingEvidence: source.namingEvidence,
+      }))
       const execution = await nativeHistory.coordinator.capture(nativeHistory.provider, {
         documentId: input.documentId,
         documentVersion: input.documentVersion,
         operationId: stage.stageId,
         operation: stage.operation,
+        resultObjectId: stage.resultObjectId,
+        ...(stage.resultObjectId === finalResultObjectId() && input.resultObjectTag !== undefined ? { resultObjectTag: input.resultObjectTag } : {}),
+        inputs: transportInputs,
+        stages: [{ stageId: stage.stageId, operation: stage.operation, inputIds: transportInputs.map(({ inputId }) => inputId), ordinal: stage.ordinal }],
         ...stage.request,
       })
       if (execution.status !== 'completed' || !execution.response) throw new Error(`Native OCCT ${stage.operation} stage history ${execution.status}.`)
@@ -1445,8 +1461,8 @@ export class BitbybitGeometryRuntime {
         ordinal: 2,
         sourceIds: { object: firstObjectId, tool: secondObjectId },
         inputs: [
-          { objectId: firstObjectId, shape: profileInput.shape, stageId: firstStageId },
-          { objectId: secondObjectId, shape: profileInput.shape, stageId: secondStageId },
+          { objectId: firstObjectId, shape: profileInput.shape, stageId: firstStageId, namingEvidence: first.capture.namingEvidence },
+          { objectId: secondObjectId, shape: profileInput.shape, stageId: secondStageId, namingEvidence: second.capture.namingEvidence },
         ],
         request: { objectStep: first.resultStep, toolStep: second.resultStep },
       })
@@ -1498,8 +1514,8 @@ export class BitbybitGeometryRuntime {
         ordinal: 2,
         sourceIds: { object: toolOneObjectId, tool: toolTwoObjectId },
         inputs: [
-          { objectId: toolOneObjectId, shape: profileInput.shape, stageId: toolOneStageId },
-          { objectId: toolTwoObjectId, shape: profileInput.shape, stageId: toolTwoStageId },
+          { objectId: toolOneObjectId, shape: profileInput.shape, stageId: toolOneStageId, namingEvidence: toolOne.capture.namingEvidence },
+          { objectId: toolTwoObjectId, shape: profileInput.shape, stageId: toolTwoStageId, namingEvidence: toolTwo.capture.namingEvidence },
         ],
         request: { objectStep: toolOne.resultStep, toolStep: toolTwo.resultStep },
       })
@@ -1512,7 +1528,7 @@ export class BitbybitGeometryRuntime {
         sourceIds: { object: baseInput.objectId, tool: fusedToolObjectId },
         inputs: [
           baseInput,
-          { objectId: fusedToolObjectId, shape: profileInput.shape, stageId: fuseStageId },
+          { objectId: fusedToolObjectId, shape: profileInput.shape, stageId: fuseStageId, namingEvidence: fusedTool.capture.namingEvidence },
         ],
         request: { objectStep: baseStep, toolStep: fusedTool.resultStep },
       })
@@ -1554,7 +1570,7 @@ export class BitbybitGeometryRuntime {
         resultObjectId: finalResultObjectId(),
         ordinal: 1,
         sourceIds: { object: rotatedProfileObjectId, tool: rotatedProfileObjectId },
-        inputs: [{ objectId: rotatedProfileObjectId, shape: profileInput.shape, stageId: rotateStageId }],
+        inputs: [{ objectId: rotatedProfileObjectId, shape: profileInput.shape, stageId: rotateStageId, namingEvidence: rotated.capture.namingEvidence }],
         request: { objectStep: rotated.resultStep, axisOrigin, direction: parameters.direction, angle: parameters.totalAngle },
       })
       return withStageCaptures([rotated.capture, revolution.capture])
@@ -1592,7 +1608,7 @@ export class BitbybitGeometryRuntime {
         resultObjectId: revolutionToolObjectId,
         ordinal: 1,
         sourceIds: { object: rotatedProfileObjectId, tool: rotatedProfileObjectId },
-        inputs: [{ objectId: rotatedProfileObjectId, shape: profileInput.shape, stageId: rotateStageId }],
+        inputs: [{ objectId: rotatedProfileObjectId, shape: profileInput.shape, stageId: rotateStageId, namingEvidence: rotated.capture.namingEvidence }],
         request: { objectStep: rotated.resultStep, axisOrigin, direction: parameters.direction, angle: parameters.totalAngle },
       })
       const cut = await captureStage({
@@ -1602,7 +1618,7 @@ export class BitbybitGeometryRuntime {
         resultObjectId: finalResultObjectId(),
         ordinal: 2,
         sourceIds: { object: baseInput.objectId, tool: revolutionToolObjectId },
-        inputs: [baseInput, { objectId: revolutionToolObjectId, shape: profileInput.shape, stageId: revolutionStageId }],
+        inputs: [baseInput, { objectId: revolutionToolObjectId, shape: profileInput.shape, stageId: revolutionStageId, namingEvidence: revolution.capture.namingEvidence }],
         request: { objectStep: baseStep, toolStep: revolution.resultStep },
       })
       return withStageCaptures([rotated.capture, revolution.capture, cut.capture])
@@ -1639,6 +1655,9 @@ export class BitbybitGeometryRuntime {
           documentVersion: input.documentVersion,
           operationId: toolStageId,
           operation: 'pad',
+          resultObjectId: toolObjectId,
+          inputs: [{ inputId: `${toolStageId}:input:0`, objectId: profileInput.objectId, role: 'object', step: profileStep.text, objectTag: profileInput.objectTag, namingEvidence: profileInput.namingEvidence }],
+          stages: [{ stageId: toolStageId, operation: 'pad', inputIds: [`${toolStageId}:input:0`], ordinal: 0 }],
           objectStep: profileStep.text,
           direction: sides[0].direction,
         })
@@ -1661,6 +1680,13 @@ export class BitbybitGeometryRuntime {
           documentVersion: input.documentVersion,
           operationId: cutStageId,
           operation: 'cut',
+          resultObjectId,
+          ...(input.resultObjectTag === undefined ? {} : { resultObjectTag: input.resultObjectTag }),
+          inputs: [
+            { inputId: `${cutStageId}:input:0`, objectId: baseInput.objectId, role: 'object', step: baseStep.text, objectTag: baseInput.objectTag, namingEvidence: baseInput.namingEvidence },
+            { inputId: `${cutStageId}:input:1`, objectId: toolObjectId, role: 'tool', stageId: toolStageId, step: toolResponse.resultStep, namingEvidence: toolResponse.namingEvidence },
+          ],
+          stages: [{ stageId: cutStageId, operation: 'cut', inputIds: [`${cutStageId}:input:0`, `${cutStageId}:input:1`], ordinal: 1 }],
           objectStep: baseStep.text,
           toolStep: toolResponse.resultStep,
         })
@@ -1745,6 +1771,9 @@ export class BitbybitGeometryRuntime {
           documentVersion: input.documentVersion,
           operationId: toolStageId,
           operation: 'revolution',
+          resultObjectId: toolObjectId,
+          inputs: [{ inputId: `${toolStageId}:input:0`, objectId: profileInput.objectId, role: 'object', step: profileStep.text, objectTag: profileInput.objectTag, namingEvidence: profileInput.namingEvidence }],
+          stages: [{ stageId: toolStageId, operation: 'revolution', inputIds: [`${toolStageId}:input:0`], ordinal: 0 }],
           objectStep: profileStep.text,
           axisOrigin,
           direction: sides[0].direction,
@@ -1769,6 +1798,13 @@ export class BitbybitGeometryRuntime {
           documentVersion: input.documentVersion,
           operationId: cutStageId,
           operation: 'cut',
+          resultObjectId,
+          ...(input.resultObjectTag === undefined ? {} : { resultObjectTag: input.resultObjectTag }),
+          inputs: [
+            { inputId: `${cutStageId}:input:0`, objectId: baseInput.objectId, role: 'object', step: baseStep.text, objectTag: baseInput.objectTag, namingEvidence: baseInput.namingEvidence },
+            { inputId: `${cutStageId}:input:1`, objectId: toolObjectId, role: 'tool', stageId: toolStageId, step: toolResponse.resultStep, namingEvidence: toolResponse.namingEvidence },
+          ],
+          stages: [{ stageId: cutStageId, operation: 'cut', inputIds: [`${cutStageId}:input:0`, `${cutStageId}:input:1`], ordinal: 1 }],
           objectStep: baseStep.text,
           toolStep: toolResponse.resultStep,
         })
@@ -1909,6 +1945,13 @@ export class BitbybitGeometryRuntime {
           documentVersion: input.documentVersion,
           operationId: cutStageId,
           operation: 'cut',
+          resultObjectId,
+          ...(input.resultObjectTag === undefined ? {} : { resultObjectTag: input.resultObjectTag }),
+          inputs: [
+            { inputId: `${cutStageId}:input:0`, objectId: baseInput.objectId, role: 'object', step: baseStep.text, objectTag: baseInput.objectTag, namingEvidence: baseInput.namingEvidence },
+            { inputId: `${cutStageId}:input:1`, objectId: toolObjectId, role: 'tool', stageId: toolStageId, step: toolStep.text, namingEvidence: createFinalShapeOnlyNamingEvidence(toolStageId, toolObjectId, 'Hole tool was synthesized by the geometry runtime; provider did not capture its builder naming evidence.') },
+          ],
+          stages: [{ stageId: cutStageId, operation: 'cut', inputIds: [`${cutStageId}:input:0`, `${cutStageId}:input:1`], ordinal: 1 }],
           objectStep: baseStep.text,
           toolStep: toolStep.text,
         })
@@ -2050,6 +2093,7 @@ export class BitbybitGeometryRuntime {
         let previousStep = baseStep.text
         let previousObjectId = baseInput.objectId
         let previousStageId: string | undefined
+        let previousNamingEvidence = baseInput.namingEvidence
         const declaredResultObjectId = input.stages?.length ? input.stages[input.stages.length - 1].resultObjectId : undefined
         for (let index = 0; index < input.transforms.length; index += 1) {
           const step = input.transforms[index]
@@ -2062,6 +2106,10 @@ export class BitbybitGeometryRuntime {
             documentVersion: input.documentVersion,
             operationId: `${input.operationId}:native-stage:${index}`,
             operation,
+            resultObjectId,
+            ...(index === input.transforms.length - 1 && input.resultObjectTag !== undefined ? { resultObjectTag: input.resultObjectTag } : {}),
+            inputs: [{ inputId: `${stageId}:input:0`, objectId: previousObjectId, role: 'object', stageId: previousStageId, step: previousStep, ...(index === 0 && baseInput.objectTag !== undefined ? { objectTag: baseInput.objectTag } : {}), namingEvidence: previousNamingEvidence }],
+            stages: [{ stageId, operation, inputIds: [`${stageId}:input:0`], ordinal: index }],
             objectStep: previousStep,
             ...(step.type === 'linear' ? { direction: step.direction } : {}),
             ...(step.type === 'polar' ? { axisOrigin: step.axisOrigin, direction: step.direction, angle: step.angle } : {}),
@@ -2085,6 +2133,7 @@ export class BitbybitGeometryRuntime {
           previousStep = response.resultStep
           previousObjectId = resultObjectId
           previousStageId = stageId
+          previousNamingEvidence = namingEvidenceForResponse(response, stageId, resultObjectId)
         }
         const records = captures[captures.length - 1].records as NativeTopologyHistoryRecords
         Object.defineProperty(records, 'stageCaptures', { value: captures, enumerable: false, configurable: false, writable: false })
diff --git a/src/facade/index.ts b/src/facade/index.ts
index d3f0d8f..b5a72dc 100644
--- a/src/facade/index.ts
+++ b/src/facade/index.ts
@@ -81,7 +81,7 @@ export { NATIVE_OCCT_NAMING_ABI_UNAVAILABLE, nativeNamingAbiCapabilities, native
 export type { NativeNamingAbiCapabilities, NativeOcctHistoryCapabilities, NativeOcctHistoryExecution, NativeOcctHistoryInputTransport, NativeOcctHistoryProvider, NativeOcctHistoryProtocolResponse, NativeOcctHistoryRequest, NativeOcctHistoryStageTransport } from './nativeHistoryProtocol'
 export { captureFreeCadPrivateNamingEvidence, createFreeCadPrivateNamingAbiRequest, FREECAD_PRIVATE_NAMING_ABI_VERSION, FREECAD_PRIVATE_NAMING_MAX_REQUEST_BYTES, FREECAD_PRIVATE_NAMING_MAX_RESPONSE_BYTES, probeFreeCadPrivateNamingAbi } from './nativeNamingAbi'
 export type { FreeCadPrivateNamingAbiDescriptor, FreeCadPrivateNamingAbiProbe, FreeCadPrivateNamingAbiRequest, NativeFreeCadNamingAbiModule } from './nativeNamingAbi'
-export { assertNativeNamingEvidence, createFinalShapeOnlyNamingEvidence, createNativeStageNamingEvidence, hasNativeMappedNameEvidence, validateNativeNamingEvidence } from './nativeNamingEvidence'
+export { assertNativeNamingEvidence, cloneNativeNamingEvidence, createFinalShapeOnlyNamingEvidence, createNativeStageNamingEvidence, hasNativeMappedNameEvidence, validateNativeNamingEvidence } from './nativeNamingEvidence'
 export type { NativeMappedNameRef, NativeMappedNameRelation, NativeNamingEvidenceIssue, NativeNamingEvidenceReport, NativeNamingEvidenceStatus, NativeStageNamingEvidence } from './nativeNamingEvidence'
 export { NativeOcctHistoryWorkerProvider } from './nativeHistoryWorkerClient'
 export type { NativeOcctHistoryWorkerOptions } from './nativeHistoryWorkerClient'
diff --git a/src/facade/mockFacade.ts b/src/facade/mockFacade.ts
index 3422db0..649b2c5 100644
--- a/src/facade/mockFacade.ts
+++ b/src/facade/mockFacade.ts
@@ -390,7 +390,7 @@ const expressionReferences = (expression: string): string[] => {
 
 const createDocumentFromTemplate = (template: DocumentTemplate): DocumentSnapshot => {
   const tree = template.tree.map((item) => ({ ...item, children: item.children ? [...item.children] : undefined }))
-  const objects = tree.map(createObjectSnapshot)
+  const objects = tree.map((item, index) => ({ ...createObjectSnapshot(item), nativeObjectTag: index + 1 }))
   const document: DocumentSnapshot = { id: template.id, label: template.label, version: template.version, dirty: template.dirty, readOnly: template.readOnly, units: template.units, tree, objects }
   document.dependencies = collectDependencyEdges(document)
   document.recompute = createRecomputeSnapshot(objects.map((object) => object.id))
@@ -799,6 +799,7 @@ export function createWebCadFacade(options: WebCadFacadeOptions = {}): BitBybitW
       tree.push(item)
     }
     const objectSnapshot = createObjectSnapshot(item)
+    objectSnapshot.nativeObjectTag = document.objects.reduce((maximum, object) => Math.max(maximum, object.nativeObjectTag ?? 0), 0) + 1
     if (commandId === 'create-body') {
       const tip = objectSnapshot.properties.find((property) => property.name === 'Tip')
       if (tip) tip.value = null
diff --git a/src/facade/nativeHistoryProtocol.ts b/src/facade/nativeHistoryProtocol.ts
index 43a0521..03118ff 100644
--- a/src/facade/nativeHistoryProtocol.ts
+++ b/src/facade/nativeHistoryProtocol.ts
@@ -1,5 +1,6 @@
 import type { NativeOcctHistoryOperation, NativeOcctHistoryResponse, NativeOcctHistoryStepProvider, NativeOcctMultiTransformStep } from './nativeHistoryProvider'
 import { captureFreeCadPrivateNamingEvidence, createFreeCadPrivateNamingAbiRequest, probeFreeCadPrivateNamingAbi } from './nativeNamingAbi'
+import type { NativeStageNamingEvidence } from './nativeNamingEvidence'
 
 export const NATIVE_OCCT_HISTORY_PROTOCOL_VERSION = 1 as const
 
@@ -61,6 +62,8 @@ export type NativeOcctHistoryRequest = {
   documentId: string
   documentVersion: number
   operationId: string
+  /** Document object produced by this native stage; distinct from the request operation ID. */
+  resultObjectId?: string
   operation: NativeOcctHistoryOperation
   transformKind?: 'linear' | 'polar' | 'mirrored'
   transforms?: NativeOcctMultiTransformStep[]
@@ -70,6 +73,7 @@ export type NativeOcctHistoryRequest = {
   inputs?: NativeOcctHistoryInputTransport[]
   stages?: NativeOcctHistoryStageTransport[]
   resultStepByStage?: Record<string, string>
+  resultObjectTag?: number
   direction?: [number, number, number]
   axisOrigin?: [number, number, number]
   angle?: number
@@ -87,9 +91,13 @@ export type NativeOcctHistoryRequest = {
 
 export type NativeOcctHistoryInputTransport = {
   inputId: string
+  /** Stable document object identity represented by this transport input. */
+  objectId?: string
   role?: string
   stageId?: string
   step: string
+  objectTag?: number
+  namingEvidence?: NativeStageNamingEvidence
 }
 
 export type NativeOcctHistoryStageTransport = {
@@ -129,6 +137,7 @@ const booleanOperations: readonly NativeOcctHistoryOperation[] = ['fuse', 'cut',
 
 const assertRequest = (request: NativeOcctHistoryRequest) => {
   if (request.protocolVersion !== NATIVE_OCCT_HISTORY_PROTOCOL_VERSION) throw new RangeError(`Unsupported native OCCT history protocol version: ${request.protocolVersion}.`)
+  if (request.resultObjectId !== undefined && !request.resultObjectId.trim()) throw new TypeError('Native OCCT history resultObjectId must be non-empty when provided.')
   if (!request.requestId.trim() || !request.documentId.trim() || !request.operationId.trim()) throw new TypeError('Native OCCT history request IDs must be non-empty strings.')
   if (!Number.isSafeInteger(request.documentVersion) || request.documentVersion < 0) throw new RangeError('Native OCCT history documentVersion must be a non-negative integer.')
   if (!['fuse', 'cut', 'common', 'rotate', 'pad', 'pocket', 'loft', 'pipe', 'revolution', 'groove', 'fillet', 'chamfer', 'hole', 'draft', 'thickness', 'linear-pattern', 'polar-pattern', 'mirrored', 'multi-transform'].includes(request.operation)) throw new RangeError(`Unsupported native OCCT history operation: ${String(request.operation)}.`)
@@ -162,6 +171,11 @@ const assertRequest = (request: NativeOcctHistoryRequest) => {
       if (!step.startsWith('ISO-10303-21;')) throw new TypeError(`Native OCCT result step for '${stageId}' requires STEP text.`)
     }
   }
+  if (request.resultObjectTag !== undefined && (!Number.isSafeInteger(request.resultObjectTag) || request.resultObjectTag <= 0)) throw new RangeError('Native OCCT history resultObjectTag must be a positive safe integer.')
+  for (const input of request.inputs ?? []) {
+    if (input.objectId !== undefined && !input.objectId.trim()) throw new TypeError(`Native OCCT history input ${input.inputId} objectId must be non-empty when provided.`)
+    if (input.objectTag !== undefined && (!Number.isSafeInteger(input.objectTag) || input.objectTag <= 0)) throw new RangeError(`Native OCCT history input ${input.inputId} objectTag must be a positive safe integer.`)
+  }
   if (booleanOperations.includes(request.operation)) {
     if (!request.toolStep?.startsWith('ISO-10303-21;')) throw new TypeError('Native Boolean history transport requires object and tool STEP text.')
   } else if (request.operation === 'pocket') {
@@ -359,8 +373,9 @@ export class DirectNativeOcctHistoryProvider implements NativeOcctHistoryProvide
       operationId: request.operationId,
       operation: request.operation,
       stageId,
-      resultObjectId: request.operationId,
-      inputs: (request.inputs ?? [{ inputId: 'object', role: 'object', step: request.objectStep }, ...(request.toolStep ? [{ inputId: 'tool', role: 'tool', step: request.toolStep }] : [])]).map(({ inputId, role, stageId: inputStageId, step }) => ({ inputId, step, ...(role ? { role } : {}), ...(inputStageId ? { stageId: inputStageId } : {}) })),
+      resultObjectId: request.resultObjectId ?? request.operationId,
+      ...(request.resultObjectTag === undefined ? {} : { resultObjectTag: request.resultObjectTag }),
+      inputs: (request.inputs ?? [{ inputId: 'object', role: 'object', step: request.objectStep }, ...(request.toolStep ? [{ inputId: 'tool', role: 'tool', step: request.toolStep }] : [])]).map(({ inputId, objectId, role, stageId: inputStageId, step, objectTag, namingEvidence }) => ({ inputId, step, ...(objectId ? { objectId } : {}), ...(role ? { role } : {}), ...(inputStageId ? { stageId: inputStageId } : {}), ...(objectTag === undefined ? {} : { objectTag }), ...(namingEvidence ? { namingEvidence } : {}) })),
       stages: orderedStages.map((stage) => ({ ...stage, inputIds: [...stage.inputIds] })),
       ...(stagedHistory.resultStep ? { resultStep: stagedHistory.resultStep } : {}),
       ...(stagedHistory.resultBrep ? { resultBrep: stagedHistory.resultBrep } : {}),
diff --git a/src/facade/nativeHistoryWorkerEntry.ts b/src/facade/nativeHistoryWorkerEntry.ts
index 85f1400..b18d86b 100644
--- a/src/facade/nativeHistoryWorkerEntry.ts
+++ b/src/facade/nativeHistoryWorkerEntry.ts
@@ -94,8 +94,9 @@ scope.onmessage = ({ data }: MessageEvent<WorkerRequest>) => {
         operationId: request.operationId,
         operation: request.operation,
         stageId,
-        resultObjectId: request.operationId,
-        inputs: (request.inputs ?? [{ inputId: 'object', role: 'object', step: request.objectStep }, ...(request.toolStep ? [{ inputId: 'tool', role: 'tool', step: request.toolStep }] : [])]).map(({ inputId, role, stageId: inputStageId, step }) => ({ inputId, step, ...(role ? { role } : {}), ...(inputStageId ? { stageId: inputStageId } : {}) })),
+        resultObjectId: request.resultObjectId ?? request.operationId,
+        ...(request.resultObjectTag === undefined ? {} : { resultObjectTag: request.resultObjectTag }),
+        inputs: (request.inputs ?? [{ inputId: 'object', role: 'object', step: request.objectStep }, ...(request.toolStep ? [{ inputId: 'tool', role: 'tool', step: request.toolStep }] : [])]).map(({ inputId, objectId, role, stageId: inputStageId, step, objectTag, namingEvidence }) => ({ inputId, step, ...(objectId ? { objectId } : {}), ...(role ? { role } : {}), ...(inputStageId ? { stageId: inputStageId } : {}), ...(objectTag === undefined ? {} : { objectTag }), ...(namingEvidence ? { namingEvidence } : {}) })),
         stages: orderedStages.map((stage) => ({ ...stage, inputIds: [...stage.inputIds] })),
         ...(history.resultStep ? { resultStep: history.resultStep } : {}),
         ...(history.resultBrep ? { resultBrep: history.resultBrep } : {}),
diff --git a/src/facade/nativeNamingAbi.ts b/src/facade/nativeNamingAbi.ts
index 15c4461..5ceaa31 100644
--- a/src/facade/nativeNamingAbi.ts
+++ b/src/facade/nativeNamingAbi.ts
@@ -1,5 +1,5 @@
 import { migrateElementMap2Schema, validateElementMap2 } from './elementMap2'
-import { assertNativeNamingEvidence, type NativeStageNamingEvidence } from './nativeNamingEvidence'
+import { assertNativeNamingEvidence, cloneNativeNamingEvidence, type NativeStageNamingEvidence } from './nativeNamingEvidence'
 import { migrateStringHasherSchema, validateElementMap2StringHasherEvidence, validateStringHasherTable } from './stringHasher'
 import type { NativeOcctHistoryOperation, NativeOcctHistoryResponse } from './nativeHistoryProvider'
 
@@ -42,7 +42,8 @@ export type FreeCadPrivateNamingAbiRequest = {
   operation: NativeOcctHistoryOperation
   stageId: string
   resultObjectId: string
-  inputs: Array<{ inputId: string; role?: string; stageId?: string; step: string }>
+  resultObjectTag?: number
+  inputs: Array<{ inputId: string; objectId?: string; role?: string; stageId?: string; step: string; objectTag?: number; namingEvidence?: NativeStageNamingEvidence }>
   stages: Array<{ stageId: string; operation?: NativeOcctHistoryOperation; inputIds: string[]; resultStageId?: string; ordinal: number }>
   resultStep?: string
   resultBrep?: string
@@ -91,12 +92,15 @@ export const probeFreeCadPrivateNamingAbi = (module: NativeFreeCadNamingAbiModul
 export const createFreeCadPrivateNamingAbiRequest = (input: Omit<FreeCadPrivateNamingAbiRequest, 'schemaVersion'>): FreeCadPrivateNamingAbiRequest => {
   if (!input.requestId.trim() || !input.documentId.trim() || !input.operationId.trim() || !input.stageId.trim() || !input.resultObjectId.trim()) throw new TypeError('FreeCAD naming ABI request IDs must be non-empty.')
   if (!Number.isSafeInteger(input.documentVersion) || input.documentVersion < 0) throw new RangeError('FreeCAD naming ABI documentVersion must be a non-negative integer.')
+  if (input.resultObjectTag !== undefined && (!Number.isSafeInteger(input.resultObjectTag) || input.resultObjectTag <= 0)) throw new RangeError('FreeCAD naming ABI resultObjectTag must be a positive safe integer.')
   return {
     schemaVersion: 1,
     ...input,
     inputs: input.inputs.map((entry) => {
       if (!entry.inputId.trim() || !entry.step.trim()) throw new TypeError('FreeCAD naming ABI inputs require non-empty inputId and STEP text.')
-      return { ...entry }
+      if (entry.objectId !== undefined && !entry.objectId.trim()) throw new TypeError(`FreeCAD naming ABI input ${entry.inputId} objectId must be non-empty when provided.`)
+      if (entry.objectTag !== undefined && (!Number.isSafeInteger(entry.objectTag) || entry.objectTag <= 0)) throw new RangeError(`FreeCAD naming ABI input ${entry.inputId} objectTag must be a positive safe integer.`)
+      return { ...entry, ...(entry.namingEvidence ? { namingEvidence: cloneNativeNamingEvidence(assertNativeNamingEvidence(entry.namingEvidence)) } : {}) }
     }),
     stages: input.stages.map((entry) => ({ ...entry, inputIds: [...entry.inputIds] })),
     ...(input.resultStepByStage ? { resultStepByStage: { ...input.resultStepByStage } } : {}),
diff --git a/src/facade/nativeNamingEvidence.ts b/src/facade/nativeNamingEvidence.ts
index e531997..814311e 100644
--- a/src/facade/nativeNamingEvidence.ts
+++ b/src/facade/nativeNamingEvidence.ts
@@ -1,5 +1,5 @@
-import type { AnyElementMap2Document, ElementMap2MappedNameReference } from './elementMap2'
-import { migrateStringHasherSchema, validateStringHasherTable, type AnyStringHasherTable } from './stringHasher'
+import { cloneElementMap2, migrateElementMap2Schema, type AnyElementMap2Document, type ElementMap2MappedNameReference } from './elementMap2'
+import { cloneStringHasherTable, migrateStringHasherSchema, validateStringHasherTable, type AnyStringHasherTable } from './stringHasher'
 
 export type NativeMappedNameRelation = 'preserved' | 'modified' | 'generated' | 'deleted' | 'ambiguous'
 
@@ -119,6 +119,22 @@ export const assertNativeNamingEvidence = <T extends NativeStageNamingEvidence>(
   return evidence
 }
 
+export const cloneNativeNamingEvidence = (evidence: NativeStageNamingEvidence): NativeStageNamingEvidence => ({
+  ...evidence,
+  mappedNames: evidence.mappedNames?.map((mapped) => ({
+    ...mapped,
+    reference: {
+      ...mapped.reference,
+      indexedName: mapped.reference.indexedName ? { ...mapped.reference.indexedName } : undefined,
+      stringIds: mapped.reference.stringIds ? [...mapped.reference.stringIds] : undefined,
+    },
+    sourceRefs: mapped.sourceRefs?.map((source) => ({ ...source })),
+    candidates: mapped.candidates?.map((candidate) => ({ ...candidate })),
+  })),
+  stringHasher: evidence.stringHasher ? cloneStringHasherTable(evidence.stringHasher) : undefined,
+  elementMap2: evidence.elementMap2 ? cloneElementMap2(migrateElementMap2Schema(evidence.elementMap2)) : undefined,
+})
+
 export const createFinalShapeOnlyNamingEvidence = (stageId: string, resultObjectId: string, reason = 'Native provider returned final Shape without MappedNameRef/StringHasher evidence.'): NativeStageNamingEvidence => ({
   schemaVersion: 1,
   stageId,
diff --git a/src/facade/persistenceWorker.ts b/src/facade/persistenceWorker.ts
index f1c96cf..2eafb2f 100644
--- a/src/facade/persistenceWorker.ts
+++ b/src/facade/persistenceWorker.ts
@@ -90,6 +90,13 @@ const initialize = async (requestedPath?: string, migrationFailureVersion?: numb
 
 const saveDocument = (document: DocumentSnapshot) => {
   if (!database) throw new Error('Persistence database is not initialized.')
+  const nativeObjectTags = new Set<number>()
+  for (const object of document.objects) {
+    if (object.nativeObjectTag === undefined) continue
+    if (!Number.isSafeInteger(object.nativeObjectTag) || object.nativeObjectTag <= 0) throw new RangeError(`Object ${object.id} nativeObjectTag must be a positive safe integer.`)
+    if (nativeObjectTags.has(object.nativeObjectTag)) throw new RangeError(`nativeObjectTag ${object.nativeObjectTag} is assigned to more than one object.`)
+    nativeObjectTags.add(object.nativeObjectTag)
+  }
   const now = Date.now()
   database.exec('BEGIN;')
   try {
@@ -98,7 +105,7 @@ const saveDocument = (document: DocumentSnapshot) => {
     database.exec({ sql: 'DELETE FROM objects WHERE document_id = ?', bind: [document.id] })
     const parentByChild = new Map<string, string>()
     for (const item of document.tree) for (const childId of item.children || []) parentByChild.set(childId, item.id)
-    document.tree.forEach((item, ordinal) => { const object = document.objects.find((candidate) => candidate.id === item.id); database?.exec({ sql: 'INSERT INTO objects(id, document_id, parent_id, label, object_type, state, detail, children_json, ordinal, sketch_json, topology_json) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)', bind: [item.id, document.id, parentByChild.get(item.id) || null, item.label, item.type, item.state || null, item.detail || null, JSON.stringify(item.children || []), ordinal, object?.sketch ? JSON.stringify(object.sketch) : null, object?.topology ? JSON.stringify(object.topology) : null] }) })
+    document.tree.forEach((item, ordinal) => { const object = document.objects.find((candidate) => candidate.id === item.id); database?.exec({ sql: 'INSERT INTO objects(id, document_id, parent_id, label, object_type, state, detail, children_json, ordinal, sketch_json, topology_json, native_object_tag) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)', bind: [item.id, document.id, parentByChild.get(item.id) || null, item.label, item.type, item.state || null, item.detail || null, JSON.stringify(item.children || []), ordinal, object?.sketch ? JSON.stringify(object.sketch) : null, object?.topology ? JSON.stringify(object.topology) : null, object?.nativeObjectTag ?? null] }) })
     for (const object of document.objects) for (const property of object.properties) database.exec({ sql: 'INSERT INTO object_properties(document_id, object_id, name, value_json, property_type, updated_at) VALUES(?, ?, ?, ?, ?, ?)', bind: [document.id, object.id, property.name, JSON.stringify(property), property.type, now] })
     database.exec({ sql: 'DELETE FROM dependencies WHERE document_id = ?', bind: [document.id] })
     for (const edge of document.dependencies ?? []) database.exec({ sql: 'INSERT INTO dependencies(document_id, source_id, target_id, relation, property_name, reference) VALUES(?, ?, ?, ?, ?, ?)', bind: [document.id, edge.sourceId, edge.targetId, edge.relation, edge.propertyName ?? null, edge.reference ?? null] })
@@ -132,7 +139,7 @@ const loadDocument = (documentId: string): DocumentSnapshot | null => {
   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>>
   const row = documents[0]
   if (!row) return null
-  const objects = database.exec({ sql: 'SELECT id, label, object_type, state, detail, children_json, sketch_json, topology_json FROM objects WHERE document_id = ? ORDER BY ordinal', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | number | null>>
+  const objects = database.exec({ sql: 'SELECT id, label, object_type, state, detail, children_json, sketch_json, topology_json, native_object_tag FROM objects WHERE document_id = ? ORDER BY ordinal', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | number | null>>
   const propertyRows = database.exec({ sql: 'SELECT object_id, value_json FROM object_properties WHERE document_id = ? ORDER BY object_id, name', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string>>
   const dependencyRows = database.exec({ sql: 'SELECT source_id, target_id, relation, property_name, reference FROM dependencies WHERE document_id = ?', bind: [documentId], rowMode: 'object', returnValue: 'resultRows' }) as Array<Record<string, string | null>>
   const propertiesByObject = new Map<string, ObjectPropertySnapshot[]>()
@@ -142,11 +149,29 @@ const loadDocument = (documentId: string): DocumentSnapshot | null => {
     propertiesByObject.set(String(propertyRow.object_id), properties)
   }
   const tree: ModelTreeItem[] = objects.map((object) => ({ id: String(object.id), label: String(object.label), type: String(object.object_type) as ModelTreeItem['type'], state: object.state ? String(object.state) as ModelTreeItem['state'] : undefined, detail: object.detail ? String(object.detail) : undefined, children: object.children_json ? JSON.parse(String(object.children_json)) as string[] : undefined }))
+  const usedNativeObjectTags = new Set<number>()
+  const persistedNativeObjectTags = new Map<string, number>()
+  for (const object of objects) {
+    if (object.native_object_tag === null || object.native_object_tag === undefined) continue
+    const nativeObjectTag = Number(object.native_object_tag)
+    if (!Number.isSafeInteger(nativeObjectTag) || nativeObjectTag <= 0) throw new Error(`Persisted object ${String(object.id)} has an invalid native object tag.`)
+    if (usedNativeObjectTags.has(nativeObjectTag)) throw new Error(`Persisted native object tag ${nativeObjectTag} is duplicated.`)
+    usedNativeObjectTags.add(nativeObjectTag)
+    persistedNativeObjectTags.set(String(object.id), nativeObjectTag)
+  }
+  let nextNativeObjectTag = 1
   const objectSnapshots: DocumentObjectSnapshot[] = tree.map((item) => {
     const properties = propertiesByObject.get(item.id) ?? []
     const typeId = properties.find((property) => property.name === 'TypeId')?.value
     const row = objects.find((candidate) => String(candidate.id) === item.id)
-    return { id: item.id, typeId: typeof typeId === 'string' ? typeId : item.type, properties, sketch: row?.sketch_json ? JSON.parse(String(row.sketch_json)) : undefined, topology: row?.topology_json ? JSON.parse(String(row.topology_json)) : undefined }
+    let nativeObjectTag = persistedNativeObjectTags.get(item.id)
+    if (nativeObjectTag === undefined) {
+      while (usedNativeObjectTags.has(nextNativeObjectTag)) nextNativeObjectTag += 1
+      nativeObjectTag = nextNativeObjectTag
+      usedNativeObjectTags.add(nativeObjectTag)
+      nextNativeObjectTag += 1
+    }
+    return { id: item.id, typeId: typeof typeId === 'string' ? typeId : item.type, nativeObjectTag, properties, sketch: row?.sketch_json ? JSON.parse(String(row.sketch_json)) : undefined, topology: row?.topology_json ? JSON.parse(String(row.topology_json)) : undefined }
   })
   return {
     id: String(row.id),
diff --git a/src/facade/projectSchema.ts b/src/facade/projectSchema.ts
index 9c4e11c..b2e208d 100644
--- a/src/facade/projectSchema.ts
+++ b/src/facade/projectSchema.ts
@@ -1,4 +1,4 @@
-export const PROJECT_SCHEMA_VERSION = 6
+export const PROJECT_SCHEMA_VERSION = 7
 
 export type ProjectSchemaMigration = { version: number; sql: string }
 
@@ -141,4 +141,5 @@ export const PROJECT_SCHEMA_MIGRATIONS = [
   { version: 4, sql: 'ALTER TABLE objects ADD COLUMN sketch_json TEXT;' },
   { version: 5, sql: 'CREATE TABLE IF NOT EXISTS document_checkpoints (document_id TEXT NOT NULL, version INTEGER NOT NULL, snapshot_json TEXT NOT NULL, created_at INTEGER NOT NULL, PRIMARY KEY (document_id, version), FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE); CREATE INDEX IF NOT EXISTS checkpoints_document_created ON document_checkpoints(document_id, created_at DESC);' },
   { version: 6, sql: 'ALTER TABLE objects ADD COLUMN topology_json TEXT;' },
+  { version: 7, sql: 'ALTER TABLE objects ADD COLUMN native_object_tag INTEGER;' },
 ] as const
diff --git a/src/facade/recomputeEngine.ts b/src/facade/recomputeEngine.ts
index d3cf852..b6a0430 100644
--- a/src/facade/recomputeEngine.ts
+++ b/src/facade/recomputeEngine.ts
@@ -580,8 +580,16 @@ const topologyForObject = async (
         documentVersion: context.documentVersion,
         operationId,
         operation: nativeOperation,
-        inputs: orderedNativeInputs.map(({ source, shape: inputShape }, index) => ({ objectId: source.id, shape: inputShape, inputId: `${object.id}:input:${index}`, role: index === 0 ? 'object' : 'tool' })),
+        inputs: orderedNativeInputs.map(({ source, shape: inputShape }, index) => ({
+          objectId: source.id,
+          shape: inputShape,
+          inputId: `${object.id}:input:${index}`,
+          role: index === 0 ? 'object' : 'tool',
+          ...(source.nativeObjectTag === undefined ? {} : { objectTag: source.nativeObjectTag }),
+          namingEvidence: source.topology?.history?.namingEvidence?.at(-1),
+        })),
         stages: [{ stageId: `${object.id}:stage:0`, operation: nativeOperation, inputObjectIds: orderedNativeInputs.map(({ source }) => source.id), resultObjectId: object.id, ordinal: 0 }],
+        ...(object.nativeObjectTag === undefined ? {} : { resultObjectTag: object.nativeObjectTag }),
         ...(nativeOperation === 'fillet' ? { radius: numericProperty('Radius', 1) } : {}),
         ...(nativeOperation === 'chamfer' ? { distance: numericProperty('Size', numericProperty('Distance', 1)) } : {}),
         ...(nativeOperation === 'hole' ? {
diff --git a/src/facade/types.ts b/src/facade/types.ts
index e876aff..8a8fd9e 100644
--- a/src/facade/types.ts
+++ b/src/facade/types.ts
@@ -108,6 +108,8 @@ export type ObjectPropertySnapshot = {
 export type DocumentObjectSnapshot = {
   id: string
   typeId: string
+  /** Stable positive App::DocumentObject tag persisted by FreeCAD's Document.xml. */
+  nativeObjectTag?: number
   properties: ObjectPropertySnapshot[]
   sketch?: SketchSnapshot
   topology?: ObjectTopologySnapshot
@@ -407,8 +409,10 @@ export type NativeTopologyHistoryInput = GeometryDocumentContext & {
   ruled?: boolean
   offset?: number
   joinType?: 'Arc' | 'Intersection'
-  inputs: Array<{ objectId: string; shape: ShapeHandle; inputId?: string; role?: string; stageId?: string }>
+  inputs: Array<{ objectId: string; shape: ShapeHandle; inputId?: string; role?: string; stageId?: string; objectTag?: number; namingEvidence?: NativeStageNamingEvidence }>
   stages?: NativeTopologyHistoryStage[]
+  /** Stable FreeCAD owner tag used when encoding the result ElementMap. */
+  resultObjectTag?: number
   result: ShapeHandle
 }
 
diff --git a/tests/facade.test.ts b/tests/facade.test.ts
index b568df2..5cb4847 100644
--- a/tests/facade.test.ts
+++ b/tests/facade.test.ts
@@ -259,8 +259,8 @@ test('viewport box selection distinguishes enclosed window objects from crossing
 })
 
 test('project schema is versioned and covers the FreeCAD document graph', () => {
-  assert.equal(PROJECT_SCHEMA_VERSION, 6)
-  assert.deepEqual(PROJECT_SCHEMA_MIGRATIONS.map((migration) => migration.version), [1, 2, 3, 4, 5, 6])
+  assert.equal(PROJECT_SCHEMA_VERSION, 7)
+  assert.deepEqual(PROJECT_SCHEMA_MIGRATIONS.map((migration) => migration.version), [1, 2, 3, 4, 5, 6, 7])
   for (const table of ['projects', 'documents', 'objects', 'object_properties', 'dependencies', 'transactions', 'resources', 'document_checkpoints']) assert.match(PROJECT_SCHEMA_SQL, new RegExp(`CREATE TABLE IF NOT EXISTS ${table}`))
   assert.match(PROJECT_SCHEMA_SQL, /CREATE INDEX IF NOT EXISTS objects_document_ordinal/)
 })
@@ -719,7 +719,7 @@ test('versioned FreeCAD private naming ABI is capability-gated and attaches vali
     freecadNamingCapabilitiesJson: () => JSON.stringify({ schemaVersion: 1, freecadVersion: '1.1.1', sourceCommit: '0108fd4b4850cc46e625b60e53cea7a7bbe69f8d', mappedNameRef: true, stringHasher: true, elementMap2: true, operations: ['cut'] }),
     freecadNamingEvidenceJson: (requestJson: string) => {
       capturedRequest = JSON.parse(requestJson) as Record<string, unknown>
-      return JSON.stringify({ schemaVersion: 1, stageId: 'cut-native:stage:0', resultObjectId: 'cut-native', status: 'native-evidence', mappedNames: [{ kind: 'edge', resultIndex: 0, resultPersistentId: 'edge-native-0', relation: 'modified', reference: { name: 'Edge1', stringIds: [0x36] }, sourceRefs: [{ objectId: 'object', persistentId: 'Edge1' }] }], stringHasher, elementMap2 })
+      return JSON.stringify({ schemaVersion: 1, stageId: capturedRequest.stageId, resultObjectId: capturedRequest.resultObjectId, status: 'native-evidence', mappedNames: [{ kind: 'edge', resultIndex: 0, resultPersistentId: 'edge-native-0', relation: 'modified', reference: { name: 'Edge1', stringIds: [0x36] }, sourceRefs: [{ objectId: 'object', persistentId: 'Edge1' }] }], stringHasher, elementMap2 })
     },
   }
   assert.deepEqual(probeFreeCadPrivateNamingAbi(module).availability, 'available')
@@ -731,6 +731,16 @@ test('versioned FreeCAD private naming ABI is capability-gated and attaches vali
   assert.equal(capturedRequest?.operation, 'cut')
   assert.equal((capturedRequest?.history as { records: unknown[] }).records.length, 1)
 
+  const inputEvidence = createFinalShapeOnlyNamingEvidence('source:stage:0', 'source')
+  await provider.capture({ protocolVersion: 1, requestId: 'naming-tags', documentId: 'doc', documentVersion: 2, operationId: 'cut-native', resultObjectId: 'cut-result', operation: 'cut', objectStep: 'ISO-10303-21; object', toolStep: 'ISO-10303-21; tool', resultObjectTag: 23, inputs: [{ inputId: 'object', objectId: 'base', role: 'object', step: 'ISO-10303-21; object', objectTag: 17, namingEvidence: inputEvidence }, { inputId: 'tool', objectId: 'tool', role: 'tool', step: 'ISO-10303-21; tool', objectTag: 19 }] }, new AbortController().signal)
+  assert.equal(capturedRequest?.resultObjectId, 'cut-result')
+  assert.equal(capturedRequest?.resultObjectTag, 23)
+  assert.equal((capturedRequest?.inputs as Array<{ objectTag?: number; namingEvidence?: { stageId: string } }>)[0].objectTag, 17)
+  assert.equal((capturedRequest?.inputs as Array<{ objectId?: string }>)[0].objectId, 'base')
+  assert.equal((capturedRequest?.inputs as Array<{ namingEvidence?: { stageId: string } }>)[0].namingEvidence?.stageId, 'source:stage:0')
+  assert.notEqual((capturedRequest?.inputs as Array<{ namingEvidence?: unknown }>)[0].namingEvidence, inputEvidence)
+  await assert.rejects(() => provider.capture({ protocolVersion: 1, requestId: 'naming-invalid-tag', documentId: 'doc', documentVersion: 2, operationId: 'cut-native', operation: 'cut', objectStep: 'ISO-10303-21; object', toolStep: 'ISO-10303-21; tool', resultObjectTag: 0 }, new AbortController().signal), /positive safe integer/)
+
   const invalid = { ...module, freecadNamingCapabilitiesJson: () => JSON.stringify({ schemaVersion: 1, freecadVersion: '1.1.1', sourceCommit: 'wrong', mappedNameRef: true, stringHasher: true, elementMap2: true, operations: ['cut'] }) }
   assert.equal(probeFreeCadPrivateNamingAbi(invalid).availability, 'unavailable')
 })
@@ -4367,6 +4377,9 @@ test('FCStd metadata writer rejects ambiguous object identity', () => {
   const document = createMockFacade().app.document.getActive()
   assert.throws(() => serializeFcstdMetadataArchive({ ...document, objects: [...document.objects, { ...document.objects[0] }] }), /unique object ids/)
   assert.throws(() => serializeFcstdMetadataArchive({ ...document, objects: [{ ...document.objects[0], id: ' ' }] }), /non-empty object ids/)
+  assert.throws(() => serializeFcstdMetadataArchive({ ...document, objects: document.objects.slice(0, 2).map((object) => ({ ...object, nativeObjectTag: 9 })) }), /assigned to more than one object/)
+  const duplicateNativeTag = zipSync({ 'Document.xml': strToU8('<Document><Objects><Object name="A" type="Part::Feature" id="4"/><Object name="B" type="Part::Feature" id="4"/></Objects></Document>') })
+  assert.throws(() => inspectFcstdArchive(duplicateNativeTag), /native id 4 is duplicated/)
 })
 
 test('FCStd inspection inventories object extensions without instantiating them', () => {
@@ -4379,7 +4392,7 @@ test('FCStd metadata writer round-trips Document and GuiDocument while preservin
   const document = {
     id: 'fcstd-writer-doc', label: 'Writer fixture', version: 1, dirty: false, readOnly: false, units: 'mm',
     tree: [{ id: 'body', label: 'Body', type: 'body' as const, state: 'active' as const }],
-    objects: [{ id: 'body', typeId: 'PartDesign::Body', properties: [
+    objects: [{ id: 'body', typeId: 'PartDesign::Body', nativeObjectTag: 37, properties: [
       { name: 'Label', label: 'Label', type: 'App::PropertyString', value: 'Body', expression: 'Spreadsheet.Width * 2', recompute: false },
       { name: 'Length', label: 'Length', type: 'App::PropertyLength', value: 12.5 },
       { name: 'Visible', label: 'Visible', type: 'App::PropertyBool', value: true },
@@ -4391,6 +4404,8 @@ test('FCStd metadata writer round-trips Document and GuiDocument while preservin
   const inspection = inspectFcstdArchive(archive)
   assert.equal(inspection.label, 'Writer fixture')
   assert.equal(inspection.objects[0].typeId, 'PartDesign::Body')
+  assert.equal(inspection.objects[0].nativeObjectTag, 37)
+  assert.equal(inspection.proxyDocument.objects[0].nativeObjectTag, 37)
   assert.equal(inspection.objects[0].properties[0].value, 'Body')
   assert.equal(inspection.objects[0].properties[0].expression, 'Spreadsheet.Width * 2')
   assert.equal(inspection.objects[0].properties.find((property) => property.name === 'Length')?.element, 'Float')