curl --request POST \
  --url https://api.veryfront.com/runs/{run_id}/cancel \
  --header 'Authorization: Bearer <token>'

{
  "cancelled": true,
  "run": {
    "run_id": "<string>",
    "kind": "agent",
    "status": "pending",
    "owner": {
      "kind": "conversation",
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    },
    "parent_run_id": "<string>",
    "root_run_id": "<string>",
    "waiting_reason": "tool",
    "created_at": "<string>",
    "started_at": "<string>",
    "completed_at": "<string>",
    "metadata": null
  }
}