curl -X POST https://api.crewship.dev/v1/threads/thr_xyz789abc/runs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {"message": "Tell me about AI agents"}
  }'

{
  "run_id": "run_abc123xyz",
  "thread_id": "thr_xyz789abc",
  "version_id": "ver_xyz789",
  "version_number": 3,
  "status": "running"
}