Advance deduplicated collection creation coverage

tests/golden/WBV2-P20-003/collection-task-plan.json

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+{
+  "schemaVersion": 1,
+  "planId": "BLENDER_WEB_PARITY_V2_COLLECTION_CREATE_EPOCH_1",
+  "status": "COMPLETED_WITH_COLLECTION_CREATE_SLICE",
+  "authority": "queue_reactivated_after_p19_parent_gate",
+  "sourcePlan": "docs/BLENDER_WEB_PARITY_TASK_PLAN_V2.json",
+  "executionPointer": "docs/EXECUTION_QUEUE.md",
+  "runtimePolicy": {
+    "blenderSource": "blender-5.2.0",
+    "browserEvidence": [
+      "chromium"
+    ],
+    "forbiddenBrowsers": [
+      "firefox",
+      "webkit"
+    ],
+    "mainAuthority": "blender_main",
+    "reusePolicy": "source_hash_and_behavior_hash_deduplication"
+  },
+  "parentParent": {
+    "manifest": "tests/golden/WBV2-P19-003/manifest.json",
+    "report": "tests/golden/WBV2-P19-003/object-parent-gate-report.json",
+    "basePending": 6618,
+    "effectivePending": 6613,
+    "duplicateValidationAvoided": true
+  },
+  "tasks": [
+    {
+      "id": "WBV2-P20-000",
+      "phase": "P20",
+      "title": "authorize_collection_create_continuation",
+      "kind": "enabling",
+      "owner": "PROGRAM",
+      "dependsOn": [
+        "WBV2-P19-003"
+      ],
+      "parityId": null,
+      "implementationClass": "LOCAL_BOUNDED",
+      "parallelGroup": "p20-governance",
+      "gate": "G2",
+      "card": "docs/tasks/WBV2-P20-000.md",
+      "behavior": "Authorize one Collection Add behavior after the P19 parent overlay.",
+      "outputs": [
+        "continuation root",
+        "candidate scope",
+        "hash boundary"
+      ],
+      "acceptance": [
+        "P19 overlay remains hash-bound",
+        "createCollection API is present",
+        "one production task is active"
+      ],
+      "status": "done",
+      "ready": false,
+      "queueMutationAllowed": true
+    },
+    {
+      "id": "WBV2-P20-001",
+      "phase": "P20",
+      "title": "select_collection_create_batch",
+      "kind": "enabling",
+      "owner": "PARITY",
+      "dependsOn": [
+        "WBV2-P20-000"
+      ],
+      "parityId": "OBJECT_OPERATIONS.COLLECTION_CREATE",
+      "implementationClass": "LOCAL_BOUNDED",
+      "parallelGroup": "p20-selection",
+      "gate": "G2",
+      "card": "docs/tasks/WBV2-P20-001.md",
+      "behavior": "Select createCollection as one unique Object Operations behavior.",
+      "outputs": [
+        "candidate report",
+        "behavior hash",
+        "dedupe key"
+      ],
+      "acceptance": [
+        "source command is hash-bound",
+        "parent/create/duplicate evidence is not rerun",
+        "one legacy operator binding is selected"
+      ],
+      "status": "done",
+      "ready": false,
+      "queueMutationAllowed": false
+    },
+    {
+      "id": "WBV2-P20-002",
+      "phase": "P20",
+      "title": "collection_create_engine_receipt",
+      "kind": "feature",
+      "owner": "OBJECT",
+      "dependsOn": [
+        "WBV2-P20-001"
+      ],
+      "parityId": "OBJECT_OPERATIONS.COLLECTION_CREATE",
+      "implementationClass": "LOCAL_EXACT",
+      "parallelGroup": "p20-object",
+      "gate": "G2",
+      "card": "docs/tasks/WBV2-P20-002.md",
+      "behavior": "Bind createCollection, undo/redo, malformed rejection, and exact save/reopen to compiled WASM Main in Chromium.",
+      "outputs": [
+        "collection production report",
+        "collection receipt",
+        "manifest"
+      ],
+      "acceptance": [
+        "collection is created",
+        "undo/redo revisions are sequential",
+        "malformed collection fails closed",
+        "save/reopen is exact"
+      ],
+      "status": "done",
+      "ready": false,
+      "queueMutationAllowed": false
+    },
+    {
+      "id": "WBV2-P20-003",
+      "phase": "P20",
+      "title": "close_collection_create_gate",
+      "kind": "enabling",
+      "owner": "RELEASE",
+      "dependsOn": [
+        "WBV2-P20-002"
+      ],
+      "parityId": null,
+      "implementationClass": "LOCAL_BOUNDED",
+      "parallelGroup": "p20-release",
+      "gate": "G5",
+      "card": "docs/tasks/WBV2-P20-003.md",
+      "behavior": "Close the createCollection gate and graduate only the exact operator binding.",
+      "outputs": [
+        "collection gate",
+        "completion overlay",
+        "manifest"
+      ],
+      "acceptance": [
+        "only collection add is claimed",
+        "effective inventory remains explicit",
+        "no duplicate validation or historical over-claim"
+      ],
+      "status": "in_progress",
+      "ready": true,
+      "queueMutationAllowed": false
+    }
+  ],
+  "parentRecoveryPlan": {
+    "path": "tests/golden/WBV2-P20-002/collection-task-plan.json",
+    "sha256": "f38ce72c1ae5bed2efef9f0a23fa1f74c35d6102ea16400a774d20661ee75258"
+  }
+}