Advance deduplicated collection creation coverage

docs/tasks/WBV2-P20-000.md

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+# WBV2-P20-000: collection create continuation root
+
+- task: WBV2-P20-000
+- parent: WBV2-P19-003
+- status: done
+- gap: workflow:authorize_collection_create_continuation
+- ownerFamily: PROGRAM
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Authorize one source-backed Collection Add behavior after the P19 parent overlay.
+
+## 验收
+
+- `node tools/web/generate-wbv2-collection-root.mjs`
+- `node tools/web/check-execution-control-plane.mjs`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P20-000/`
+- Manifest: `tests/golden/WBV2-P20-000/manifest.json`
+- Rollback: restore P19-003 as queue parent.