Add Chromium-only Blender WebEngine parity work

docs/status/W-025.md

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+# W-025 Status
+
+status: done
+task: 建立 Web C ABI
+
+## Evidence
+
+- Header: `blender-5.2.0/source/blender/web_engine/web_engine_api.h`
+- Implementation: `blender-5.2.0/source/blender/web_engine/web_engine_api.cpp`
+- Golden: `tests/golden/W-025/c-api.json`
+
+The ABI now has stable POD pointer/length entry points for create/destroy,
+open, apply, snapshot, save and buffer release. Open accepts an empty input;
+command and full `.blend` serialization return an explicit not-implemented
+code until Blender libraries are linked.
+
+## Verification
+
+```text
+tools/web/build-web-engine-variants.sh  # passed
+node tools/web/run-web-engine-smoke.mjs  # passed
+```