Add Chromium-only Blender WebEngine parity work

docs/status/W-039.md

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+# W-039 Status
+
+status: done_current_scope
+task: 完成场景数据里程碑
+
+## Current gate
+
+The `.blend` -> Blender Main/WASM -> binary SceneIR -> Three.js path is proven
+for basic, animation, pose, modifier, resource and authoring fixtures. The
+browser opens files, renders geometry, keeps Outliner/viewport selection linked,
+and applies Main edits with revisioned snapshot/delta responses.
+
+## Accepted bounded scope
+
+W-034 through W-038 are complete for the declared bounded contract: binary
+SceneIR, resource deltas, packed assets, animation editing and Blender Main
+authoring all have native and browser regression evidence. New Blender
+families must add independent goldens instead of reusing W-080.
+
+## Verification
+
+```text
+npm --prefix web run test:e2e
+npm --prefix web run test:authoring-roundtrip
+```