Advance deduplicated collection creation coverage

docs/tasks/WBV2-P20-003.md

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+# WBV2-P20-003: close collection create gate
+
+- task: WBV2-P20-003
+- parent: WBV2-P20-002
+- status: in_progress
+- gap: workflow:close_collection_create_gate
+- ownerFamily: RELEASE
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Close the createCollection gate and graduate only the exact operator binding.
+
+## 输入与范围
+
+- Focused receipt: `tests/golden/WBV2-P20-002/collection-create-receipt-report.json`
+- Previous overlay: `tests/golden/WBV2-P19-003/inventory-completion-overlay.json`
+- Production entrypoint: `node tools/web/generate-wbv2-collection-gate.mjs --write`
+
+## 验收
+
+- only collection add is claimed
+- effective inventory remains explicit
+- duplicate validation remains zero
+- malformed, hash-drift, unsupported, or false-completion input keeps in_progress
+- historical reproduction remains false
+- `node tools/web/check-task-context.mjs --task WBV2-P20-003 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P20-003/`
+- Status: `docs/status/WBV2-P20-003.md`
+- Manifest: `tests/golden/WBV2-P20-003/manifest.json`
+- Rollback: restore P20-002 as queue parent.