Add Chromium-only Blender WebEngine parity work

docs/status/W-026.md

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+# W-026 Status
+
+status: done
+task: 接入 Blender 报告系统边界
+
+## Evidence
+
+- Error ABI: `web_engine_last_error_code()` and
+  `web_engine_last_error_message()`
+- Golden: `tests/golden/W-026/error-report.json`
+- Error codes are deterministic and do not expose raw WASM pointers to the UI.
+
+The native Blender `ReportList` bridge is deferred until W-030 data libraries
+are linked; this task freezes the Web-facing error contract first.
+
+## Verification
+
+```text
+node tools/web/run-web-engine-smoke.mjs  # explicit -3 not-implemented path
+```