Add Chromium-only Blender WebEngine parity work

docs/status/W-032.md

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+# W-032 Status
+
+status: done
+task: 导出场景树和集合
+
+## Evidence
+
+- C++ collection/object traversal: `web_engine_blend_reader.cpp`
+- Dynamic Outliner: `web/app/src/app/App.tsx`
+- Golden: `tests/golden/W-032/basic-scene-tree.json`
+
+The reader resolves Scene root collections, linked collection objects, object
+parent/data links, active camera, local/world matrices, viewport visibility and
+selectability. Collection and node arrays are sorted by stable IDs before
+serialization; parent cycles fall back to the local matrix instead of recursing
+without a bound.
+
+## Verification
+
+```text
+node tools/web/run-web-engine-smoke.mjs
+npm run test:e2e  # local basic_scene.blend appears in Outliner
+```
+
+## Remaining risk
+
+The fixture proves one nested collection. View-layer overrides and evaluated
+depsgraph visibility remain part of the later scene-context work.