Add Chromium-only Blender WebEngine parity work

docs/status/W-024.md

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+# W-024 Status
+
+status: done
+task: 固定内存和分配策略
+
+## Evidence
+
+- Memory ABI: `web_engine_get_memory_stats()` and scalar accessors
+- Golden: `tests/golden/W-024/memory-stats.json`
+- Node smoke: `tools/web/run-web-engine-smoke.mjs`
+
+The ABI reports live handles and allocated bytes without exposing WASM heap
+pointers to React. Document memory is held inside the engine state and output
+buffers are explicitly freed after save; the first mesh snapshot also retains
+bounded arrays before the later transferable-buffer path.
+
+## Verification
+
+```text
+node tools/web/run-web-engine-smoke.mjs  # blend open/save, then destroy
+```