Add Chromium-only Blender WebEngine parity work

docs/status/W-031.md

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+# W-031 Status
+
+status: done
+task: 定义 SceneIR v1
+
+## Evidence
+
+- TypeScript contract: `web/protocol/scene-ir.ts`
+- C++ serializer: `blender-5.2.0/source/blender/web_engine/web_engine_blend_reader.cpp`
+- Golden: `tests/golden/W-031/scene-ir-v1.json`
+
+SceneIR v1 now carries versioned source metadata, Blender Z-up coordinate
+semantics, stable type/name IDs, nodes, collections, meshes, materials, images,
+cameras, lights, animations, scenes, frame bounds and active object. Browser
+validation rejects unsupported schema, coordinate, matrix and tuple shapes.
+IDs are generated from Blender ID names with deterministic duplicate suffixes;
+the wire format contains no raw WASM pointer.
+
+## Verification
+
+```text
+npm run typecheck
+node tools/web/run-web-engine-smoke.mjs
+```
+
+## Remaining risk
+
+Image and animation arrays are schema-ready but are still empty until their
+datablock extraction tasks are implemented.