Brain API HTTP 504: {
  "ok": false,
  "error": "Academy model request timed out",
  "retryable": true,
  "infrastructure_failure": true,
  "output_contract": "academy_round_json_v6",
  "exam_round": 3,
  "timeout_seconds": 360,
  "timeout_stage": "ollama_generation",
  "raw_answer": "",
  "raw_answer_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "raw_answer_audited": true,
  "model_retry_count": 0,
  "model_retry_reason": "",
  "initial_raw_answer": "",
  "initial_raw_answer_sha256