{
    "description": "Codex family: generated-image becomes a generated-image block keeping {imageId, fileName, mimeType}; the wire source (inline media provenance) and sourceImageId are web rendering concerns and are dropped by the projection.",
    "expected": {
        "blocks": [
            {
                "createdAt": 1755000000000,
                "fileName": "latency-chart.png",
                "id": "msg-codex-521:0",
                "imageId": "img-01J9ZD8KM4TQ",
                "kind": "generated-image",
                "localId": null,
                "mimeType": "image/png"
            }
        ],
        "hasReadyEvent": false,
        "latestUsage": null,
        "visibleBlocks": [
            {
                "createdAt": 1755000000000,
                "fileName": "latency-chart.png",
                "id": "msg-codex-521:0",
                "imageId": "img-01J9ZD8KM4TQ",
                "kind": "generated-image",
                "localId": null,
                "mimeType": "image/png"
            }
        ]
    },
    "fixtureVersion": 1,
    "input": {
        "agentState": null,
        "messages": [
            {
                "content": {
                    "content": {
                        "data": {
                            "fileName": "latency-chart.png",
                            "id": "aed0f1b2-5fb6-4c2d-8e9d-e2f3a4b5c521",
                            "imageId": "img-01J9ZD8KM4TQ",
                            "mimeType": "image/png",
                            "source": {
                                "flavor": "codex",
                                "ingress": "tool_result",
                                "toolCallId": "call_img_58210"
                            },
                            "sourceImageId": "ig_58210",
                            "type": "generated-image"
                        },
                        "type": "codex"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000000000,
                "id": "msg-codex-521",
                "localId": null,
                "seq": 1
            }
        ],
        "options": {
            "hasMoreMessages": false
        }
    },
    "name": "codex-generated-image"
}