ClaimedJob

A job claimed for dispatch — the caller starts exactly one agent session per ClaimedJob,
carrying its single cogmap_id (the fan-out is over the workflow, never the agent's target).

{
    "attempts": 0,
    "cogmap_id": "b2008c45-9f31-4aae-8f49-0cadcb6ad25e",
    "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08"
}