Rebuild local Blender WASM environment and recovery evidence

docs/status/WBV2-P2-005.md

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+# WBV2-P2-005 status
+
+- task: `WBV2-P2-005`
+- parent: `WBV2-P2-004`
+- parity: `WORKFLOW.P0_USER_LOOP`
+- implementationClass: `LOCAL_BOUNDED`
+- status: `done`
+- fixture: `tests/files/web/generated/WBV2-P2-005-WORKFLOW.P0_USER_LOOP.blend`
+
+## Evidence
+
+- Desktop and WASM preserve the cube fixture through open and save/reopen; Main executes create, transform, undo and redo with revisions `1 -> 5`.
+- Chromium production flow saves the initial revision, edits the scene, recovers the edited scene after an engine Worker fault, cancels a 40 MiB open without replacing the scene, and exports a valid GLB.
+- Malformed blend input is rejected without Main mutation; cancellation cleanup reports zero live reader and engine requests.
+
+## Commands
+
+- `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/WBV2-P2-005.py -- tests/files/web/generated/WBV2-P2-005-WORKFLOW.P0_USER_LOOP.blend`
+- `npm --prefix web run test:generated-gap -- --task WBV2-P2-005`
+- `node tools/web/check-generated-gap.mjs --task WBV2-P2-005`
+- `node tools/web/check-task-context.mjs --task WBV2-P2-005 --write`
+
+## Handoff
+
+- nextTask: `WBV2-P3-001`
+- queue mutation: allowed after manifest and parent hash validation