Advance deduplicated collection creation coverage

docs/tasks/WBV2-P20-002.md

@@ -0,0 +1,34 @@
+# 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.