{
    "description": "Claude output family: a user-typed entry whose string content is a <task-notification> envelope normalizes as sidechain; the reducer extracts the <summary> as an agent-event of type message (no parentUuid on the wire keeps it in the root lane).",
    "expected": {
        "blocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-user-231",
                "kind": "user-text",
                "localId": null,
                "text": "Run the dev server in the background."
            },
            {
                "createdAt": 1755000009000,
                "event": {
                    "message": "Background command \"bun run dev\" exited with code 0",
                    "type": "message"
                },
                "id": "msg-agent-232:0",
                "kind": "agent-event"
            }
        ],
        "hasReadyEvent": false,
        "latestUsage": null,
        "visibleBlocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-user-231",
                "kind": "user-text",
                "localId": null,
                "text": "Run the dev server in the background."
            },
            {
                "createdAt": 1755000009000,
                "event": {
                    "message": "Background command \"bun run dev\" exited with code 0",
                    "type": "message"
                },
                "id": "msg-agent-232:0",
                "kind": "agent-event"
            }
        ]
    },
    "fixtureVersion": 1,
    "input": {
        "agentState": null,
        "messages": [
            {
                "content": {
                    "content": {
                        "text": "Run the dev server in the background.",
                        "type": "text"
                    },
                    "role": "user"
                },
                "createdAt": 1755000000000,
                "id": "msg-user-231",
                "localId": null,
                "seq": 1
            },
            {
                "content": {
                    "content": {
                        "data": {
                            "message": {
                                "content": "<task-notification><task-id>bash_1</task-id><summary>Background command \"bun run dev\" exited with code 0</summary></task-notification>"
                            },
                            "type": "user",
                            "uuid": "d5e6f7a8-4b5c-4d6e-9f7a-b8c9d0e1f232"
                        },
                        "type": "output"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000009000,
                "id": "msg-agent-232",
                "localId": null,
                "seq": 2
            }
        ],
        "options": {
            "hasMoreMessages": false
        }
    },
    "name": "claude-task-notification"
}