Add Chromium-only Blender WebEngine parity work

docs/status/W-033.md

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+# W-033 Status
+
+status: done_current_scope
+task: 导出 MeshIR
+
+## Implemented
+
+Mesh summaries export vertex, edge, face and corner counts. Blender 5.2
+`AttributeStorage` DATA blocks are now resolved by exact old-pointer matches
+and by SDNA pointer width. The reader exports position floats, normals,
+triangulated corner indices, corner UV/color attributes, triangle material
+indices, material slot IDs and object-space bounds with
+`geometryStatus: "available"`. The Three adapter applies Z-up conversion,
+uses exported normals, expands corner attributes into render vertices, and
+binds local material groups.
+
+## Accepted bounded scope
+
+The exporter now includes tangent and corner split-normal buffers, seam/sharp
+edge flags, custom attribute metadata, vertex groups and UV-layer selection.
+The native WBG1 C ABI carries these buffers without JSON construction and the
+Worker validates/transfers them to Three.js. Mesh Edit operations rebuild
+topology metadata through Blender Main and reject linked/shape-key topology
+changes with structured errors.
+
+Evaluated buffers for unsupported modifier/simulation families remain blocked
+by the N-002 capability matrix; this is an explicit boundary rather than a
+claim of universal modifier evaluation.
+
+The field and future transferable layout is documented in
+`docs/web/mesh-buffer-layout.md`.
+
+## Verification
+
+```text
+node tools/web/run-web-engine-smoke.mjs  # basic + attribute fixtures
+```