Rebuild local Blender WASM environment and recovery evidence

docs/status/WBV2-P2-004.md

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+# WBV2-P2-004 status
+
+- task: `WBV2-P2-004`
+- parent: `WBV2-P2-003`
+- parity: `VIEWPORT.MAIN_OFFSCREEN`
+- implementationClass: `LOCAL_BOUNDED`
+- status: `done`
+- fixture: `tests/files/web/generated/WBV2-P2-004-VIEWPORT.MAIN_OFFSCREEN.blend`
+
+## Evidence
+
+- Desktop and WASM load the same cube/camera SceneIR and preserve node, mesh, camera and scene data across save/reopen.
+- Chromium production dist renders nonblank pixels through both main-thread WebGL and Offscreen worker paths.
+- Selection and camera state are identical across backends; main-thread `WEBGL_lose_context` recovery returns ready with nonblank readback, and Offscreen disposal/reopen is exact.
+- Malformed blend input is rejected without mutating Main.
+
+## Commands
+
+- `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/WBV2-P2-004.py -- tests/files/web/generated/WBV2-P2-004-VIEWPORT.MAIN_OFFSCREEN.blend`
+- `npm --prefix web run test:generated-gap -- --task WBV2-P2-004`
+- `node tools/web/check-generated-gap.mjs --task WBV2-P2-004`
+- `node tools/web/check-task-context.mjs --task WBV2-P2-004 --write`
+
+## Handoff
+
+- nextTask: `WBV2-P2-005`
+- queue mutation: allowed after manifest and parent hash validation