Rebuild local Blender WASM environment and recovery evidence

docs/tasks/WBV2-P8-000.md

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+# WBV2-P8-000: recovery capability root
+
+- task: WBV2-P8-000
+- parent: WBV2-P7-003
+- status: done
+- gap: workflow:authorize_recovery_capability_root
+- ownerFamily: PROGRAM
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Authorize an explicit recovery epoch without changing the blocked P7 evidence.
+
+## 验收
+
+node tools/web/generate-wbv2-recovery-root.mjs
+node tools/web/check-execution-control-plane.mjs
+node tools/web/check-v2-task-index.mjs