Advance WBV2 domain parity through P12

docs/tasks/WBV2-P12-000.md

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+# WBV2-P12-000: domain expansion continuation root
+
+- task: WBV2-P12-000
+- parent: WBV2-P11-004
+- status: done
+- gap: workflow:authorize_domain_expansion_continuation
+- ownerFamily: PROGRAM
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Authorize the next high-value Blender Web domains after P11 established engine-bound Mesh, Modifier, and Asset evidence. P12 uses existing source receipts first, then adds only bounded native/WASM domain behavior.
+
+## 验收
+
+- `node tools/web/generate-wbv2-domain-expansion-root.mjs`
+- `node tools/web/check-execution-control-plane.mjs`
+- `node tools/web/check-v2-task-index.mjs`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P12-000/`
+- Manifest: `tests/golden/WBV2-P12-000/manifest.json`
+- Rollback: restore P11-004 as queue parent without rewriting prior evidence.