Rebuild local Blender WASM environment and recovery evidence

docs/tasks/WBV2-P8-004.md

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+# WBV2-P8-004: recompute recovery release gate
+
+- task: WBV2-P8-004
+- parent: WBV2-P8-003
+- status: in_progress
+- gap: workflow:recompute_recovery_release_gate
+- ownerFamily: RELEASE
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Recompute the final release decision from 45 atomic Chromium receipts and the explicit M12 provenance epoch.
+
+## 输入与范围
+
+- Atomic receipts: `tests/golden/WBV2-P8-002/atomic-receipt-index.json`
+- M12 epoch: `tests/golden/WBV2-P8-003/m12-provenance-epoch.json`
+- Release gate: `tools/web/check-wbv2-recovery-release-gate.mjs`
+
+## 验收
+
+node tools/web/check-wbv2-recovery-release-gate.mjs --write
+node tools/web/check-task-context.mjs --task WBV2-P8-004 --write
+
+Missing receipt, provenance ambiguity, hash drift, unsupported release claim, or governance failure must keep in_progress and must not advance nextTask.
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P8-004/`
+- Status: `docs/status/WBV2-P8-004.md`
+- Manifest: `tests/golden/WBV2-P8-004/manifest.json`
+- Rollback: restore P8-003 as queue parent and preserve all historical evidence.