Add Chromium-only Blender WebEngine parity work

docs/status/W-027.md

@@ -0,0 +1,27 @@
+# W-027 Status
+
+status: done
+task: 建立真实 WebEngineWorker ready 路径
+
+## Evidence
+
+- Worker: `web/app/src/workers/web-engine.worker.ts`
+- Client: `web/app/src/engine-client/WebEngineClient.ts`
+- Vendored runtime: `web/app/src/vendor/blender/web_engine.js` and
+  `web/app/src/vendor/blender/web_engine.wasm`
+- Static deployment copies: `web/app/public/vendor/blender/`
+- Install script: `tools/web/install-web-engine-assets.sh`
+- Golden: `tests/golden/W-027/worker-ready.json`
+
+The worker dynamically imports the local Emscripten glue, fetches the local
+WASM asset, initializes the ABI and returns deterministic memory stats. The UI
+reports this as `WASM ABI: ready`; `.blend` loading now uses the same real ABI
+and returns SceneIR snapshots. The legacy mock EngineClient remains only for
+protocol regression tests.
+
+## Verification
+
+```text
+npm run test:e2e  # 4 passed, including local web_engine worker
+npm run build     # web-engine.worker and vendor/blender assets present
+```