Claims the room. `200` with `owned: false` means somebody else holds it and the caller must withdraw — that is not an error condition and is not reported as one.

Wire body for POST /api/chat/rooms/{roomId}/genai-owner, the assistant's ownership claim. accountId and departmentId travel as query parameters, so the body carries only the caller's identity.

Wire response for the ownership claim.

owned: false is a normal outcome, not an error: it means somebody else holds the room — typically a human agent assigned between the caller's last check and this call — and the caller must withdraw, publish nothing, and leave the conversation alone.