Add Chromium-only Blender WebEngine parity work

docs/status/W-030.md

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+# W-030 Status
+
+status: done
+task: 从内存读取 `.blend`
+
+## Evidence
+
+- Reader: `blender-5.2.0/source/blender/web_engine/web_engine_blend_reader.cpp`
+- ABI: `web_engine_open_blend(handle, data, length)` copies an `ArrayBuffer` into
+  WASM memory and never receives a browser or POSIX path.
+- Worker: `web/app/src/workers/web-engine.worker.ts` reports started/progress/completed
+  phases and maps malformed input to `BLEND_READ_FAILED`.
+- Golden: `tests/golden/W-030/manifest.json`
+
+The reader accepts uncompressed, gzip and zstd Blender streams, validates the
+little-endian Blender header, decodes the embedded DNA1 schema and returns an
+empty or populated SceneIR snapshot. `empty.blend` and `basic_scene.blend` are
+both exercised by the WASM smoke.
+
+## Verification
+
+```text
+node tools/web/run-web-engine-smoke.mjs  # empty + basic + save passed
+tools/web/check-dual-engine.sh           # native ABI + WASM reader passed
+```
+
+## Remaining risk
+
+The first reader is deliberately bounded to a 1 GiB block and summary export;
+evaluated mesh buffers are W-033.