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.

docs/tasks/WBV2-P20-001.md

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+# WBV2-P20-001: select_collection_create_batch
+
+- task: WBV2-P20-001
+- parent: WBV2-P20-000
+- status: in_progress
+- gap: capability:OBJECT_OPERATIONS.COLLECTION_CREATE
+- ownerFamily: PARITY
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Select createCollection as one unique Object Operations behavior.
+
+## 输入与范围
+
+- Focused source: `blender-5.2.0/source/blender/web_engine/web_engine_api.cpp`
+- Existing client: `web/app/src/engine-client/WebEngineClient.ts`
+- Inventory: `tests/golden/WBV2-P0-002/parity-map.json`
+- Production entrypoint: `node tools/web/generate-wbv2-collection-selection.mjs --write`
+
+## 验收
+
+- source command is hash-bound
+- parent/create/duplicate evidence is not rerun
+- one legacy operator binding is selected
+- malformed, hash-drift, unsupported, or false-completion input keeps in_progress
+- `node tools/web/check-task-context.mjs --task WBV2-P20-001 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P20-001/`
+- Status: `docs/status/WBV2-P20-001.md`
+- Manifest: `tests/golden/WBV2-P20-001/manifest.json`
+- Rollback: restore P20-000 as queue parent.

docs/tasks/WBV2-P20-002.md

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+# WBV2-P20-002: collection create engine receipt
+
+- task: WBV2-P20-002
+- parent: WBV2-P20-001
+- status: in_progress
+- gap: capability:OBJECT_OPERATIONS.COLLECTION_CREATE
+- ownerFamily: OBJECT
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Bind createCollection, undo/redo, malformed rejection, and exact save/reopen to compiled WASM Main in Chromium.
+
+## 输入与范围
+
+- Focused source: `tests/golden/WBV2-P20-001/collection-selection-report.json`
+- Production test: `web/tests/e2e/wbv2-collection-create-production.spec.ts`
+- Production entrypoint: `npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-collection-create-production.spec.ts`
+
+## 验收
+
+- collection is created
+- undo/redo revisions are sequential
+- malformed collection fails closed without Main mutation
+- save/reopen is exact and deterministic
+- Chromium is the only browser
+- `node tools/web/check-task-context.mjs --task WBV2-P20-002 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P20-002/`
+- Status: `docs/status/WBV2-P20-002.md`
+- Manifest: `tests/golden/WBV2-P20-002/manifest.json`
+- Rollback: restore P20-001 as queue parent.

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.