Add Chromium-only Blender WebEngine parity work

docs/status/W-075.md

@@ -0,0 +1,86 @@
+# W-075 Status
+
+status: in_progress  
+task: 实现三种模式和修改器堆栈求值
+
+The React Properties editor now exposes a Blender-style Decimate inspector for
+all three native modes. Collapse has ratio, triangulate and optional symmetry
+axis controls; Un-Subdivide has bounded iterations; Dissolve Planar has angle,
+boundary handling and Normal/Material/Seam/Sharp/UV delimit toggles. A shared
+attribute-policy selector makes preservation or dropping explicit. Browser E2E
+switches through the mode-specific controls, while native probes confirm all
+three BMesh entry points execute against the local WASM artifact.
+
+Applying the inspector commits a revisioned `decimateMesh` command. A
+`previewDecimateMesh` command now evaluates the profile in a separate WASM
+module instance, returns temporary geometry to the Three.js viewport, keeps
+the authoritative handle/revision unchanged and supports explicit cancellation
+from the inspector.
+
+The SceneIR contract now carries modifier UUID/type/name/enabled state and a
+deterministic modifier-stack hash. The native `.blend` reader traverses each
+`Object.modifiers` list, uses Blender's persistent modifier UID for a stable
+UUID when available, and exports viewport/render modes plus common Subsurf,
+Mirror, Decimate and Bevel parameters. The generated
+`rigged_shape_scene.blend` fixture verifies the real Decimate modifier payload
+instead of a mock stack. The native command
+`setModifierEnabled` toggles a declared modifier, and the native history ring
+implements bounded undo/redo with revisioned snapshots. React exposes the
+modifier checkbox and top-bar undo/redo commands; browser E2E verifies that
+undo/redo changes the authoritative native snapshot rather than a Three.js
+shadow copy. Native smoke now covers the same modifier toggle and its
+undo/redo cycle against a local WASM engine.
+
+`protocol/modifier-graph.ts` now builds a stable per-mesh topological order from
+stack order and explicit `dependsOn` edges. Cycles and unresolved external
+inputs produce `BLOCKED` with the offending IDs; declared but unexecuted
+modifiers remain `METADATA_ONLY`. The WebEngine Worker requires `EVALUATED`
+before Decimate preview, commit or LOD generation. Browser E2E checks the
+topological order, metadata-only handling and cycle blocking.
+
+The WebEngine exposes `evaluateDepsgraph` and the native module executes
+Blender 5.2's `BLO_read_from_memory` loader, headless runtime bootstrap,
+view-layer sync, graph build, tagged update and frame evaluation. A wasm32 DNA
+alignment bridge and the Web ID registry for NodeTree/Camera/Light preserve the
+current C++ layout. The report contains evaluated mesh positions/triangles,
+source Mesh IDs, object world matrices and modifier counts. The report also
+contains ordered modifier entries with persistent UID, mode flags, stack
+dependencies and explicit `EVALUATED`, `DISABLED` or `BLOCKED` status with
+stable error codes and suggestions. Empty,
+basic and rigged/shape-key fixtures now pass without a WASM trap; the rigged
+positions match the Blender deformation golden. Broader modifier and constraint
+parity is tracked separately and unsupported cases remain structured errors.
+The lightweight reader's name table now covers all Blender 5.2 DNA modifier
+slots 0 through 86, including the Grease Pencil range, with a compile-time size
+check. Recognition remains separate from evaluated parity in
+`docs/web/modifier-support-matrix.md`.
+SceneIR now extracts target IDs and core parameters for Lattice, Curve,
+Armature, Hook, Mesh Deform, Shrinkwrap and Surface Deform, and appends their
+external objects to `dependsOn`; they deliberately remain `METADATA_ONLY`.
+
+Six reproducible Blender 5.2 category goldens now cover Generate, Deform,
+legacy Curve, Physics/time, Geometry Nodes and Grease Pencil. The native report
+now includes non-Mesh objects, including all 26 Grease Pencil modifier types
+exposed by Blender 5.2 Python. Twenty-four category types now have evaluated Web
+goldens. Subdivision uses the local OpenSubdiv 3.7.0 CPU evaluator and matches
+the 26-vertex/48-triangle desktop result. Exact Boolean uses local GMP 6.3.0
+and matches the 12-vertex/20-triangle surface result; coplanar triangulation is
+compared by oriented surface area because wasm32 and desktop can select
+different valid diagonals. Curve now runs its native modifier and matches the
+desktop golden after the Web ID registry was extended for Curves data.
+
+Geometry Nodes has bounded native implementations for a single constant
+Transform Geometry or Set Position node. Both topology/position results match
+Blender 5.2. Unknown graphs retain `BLENDER_MODIFIER_ERROR`; simulation zones
+and bake data preserve input geometry and return
+`GEOMETRY_NODES_SIMULATION_UNAVAILABLE`. The full node registration/lazy-function
+runtime is not claimed. Displace adds a bounded constant local-space closure;
+resource-dependent configurations return `MODIFIER_CONFIGURATION_UNSUPPORTED`.
+Grease Pencil modifiers remain disabled.
+Mesh and Surface Deform fixtures continue to serialize real bind caches and
+deform their cage/target after binding.
+
+This is not yet complete native Blender dependency-graph parity. Unsupported
+external runtime resources and unsupported modifier/constraint types return
+structured errors; the lightweight SceneIR history remains separate and is not
+silently serialized as a full Blender undo stack.