Add Chromium-only Blender WebEngine parity work

docs/status/W-079.md

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+# W-079 Status
+
+status: in_progress  
+task: 三角面简化和轻量化里程碑
+
+The Blender golden fixture is checked by
+`tools/web/run-blender-golden.mjs`. It opens the local
+`tests/files/web/basic_scene.blend`, evaluates native Collapse in fresh WASM
+instances at ratios `1.0`, `0.9`, `0.5` and `0.25`, and compares source object
+identity, vertex counts and evaluated loop-triangle counts with
+`tests/golden/W-079/basic-scene-decimate.json`. The test is runnable offline as
+`npm run test:golden` and currently passes. The focused native memory regression
+gate `npm run test:collapse-ratios` starts an isolated WASM instance for each
+target and asserts a successful non-empty result. The matrix now also includes the
+previously unstable intermediate ratios `0.80`, `0.75`, `0.70` and `0.65`.
+
+LOD generation evaluates each requested profile in an isolated Worker/WASM
+instance. A failure at one target records `requestedLevel`, `triangleBudget`
+and the diagnostic message in `WebEngineLODResult.errors`; the remaining levels
+are reindexed and cached. The native bridge now avoids the former multi-collapse
+heap lifetime failure by running one native Collapse pass per fresh heap, so the
+intermediate golden ratios no longer fault.
+
+The reader retains 64-bit on-disk BHead pointer identities in WASM and resolves
+duplicate `BLEND_DATA` attribute arrays in the owning Mesh block range. This
+prevents a second mesh from inheriting the first mesh's attributes. The offline
+`npm run test:topology-collapse` regression confirms successful native Collapse
+for an open quad, an open n-gon and a non-manifold shared edge.
+
+The rigged fixture also now runs Collapse with a preserving `skinPolicy`.
+Native output projects to the source triangles, remaps fixed four-slot weights
+and rebuilds shape-key positions, while a missing policy remains blocked. The
+same path is covered through the browser WebEngine Worker.
+
+The deformation fixture now records an actual Blender 5.2 evaluated-depsgraph
+golden with shape-key value and armature pose applied. The Web deformation
+worker compares linear bind/rest/pose evaluation against the declared max and
+RMS error budget. Packed-image extraction, GLB semantic re-import and the Web
+deformation golden are covered by focused browser tests.
+
+The native Blender Depsgraph path now completes full loader, view-layer sync,
+graph build, tagged update and frame evaluation in the headless WASM build for
+the empty, basic and rigged/shape-key fixtures. A wasm32-specific DNA layout
+adapter recursively restores 8-byte alignment for 64-bit members; this fixes
+the `Scene.master_collection` offset and prevents the former memory trap. The
+Web ID registry includes embedded NodeTree, Camera and Light data, and the
+rigged output matches the Blender 5.2 deformation golden within its max/RMS
+budgets. The report now exposes ordered native modifier entries, persistent UIDs,
+mode flags, target object IDs, stack dependencies and explicit Blender evaluation errors; the
+rigged fixture verifies Armature followed by a structured Decimate block on its
+two-triangle input. N-001 is complete for the declared fixtures and N-002 has
+started with this report contract; broader modifier, constraint and stress
+coverage remains tracked by N-002/N-003/N-008.
+
+The broad Decimate mode/performance matrix and Blender round-trip warnings are
+still tracked as follow-up coverage; unsupported cases must remain structured
+errors and cannot be treated as parity.