curl -X GET "https://api.usesynth.ai/api/policy-optimization/online/jobs/{job_id}/results" \
  -H "Authorization: Bearer $SYNTH_API_KEY"

{
  "job_id": "po_abc123",
  "status": "completed",
  "best_reward": 0.94,
  "best_prompt": {
    "messages": [
      {"role": "system", "content": "You are a helpful assistant..."}
    ],
    "reward": 0.94
  },
  "lever_summary": {
    "prompt_lever_id": "mipro.prompt.sys_abc",
    "candidate_lever_versions": {
      "baseline": 1,
      "candidate_9b12": 4
    },
    "best_candidate_id": "candidate_9b12",
    "selected_candidate_id": "candidate_9b12",
    "baseline_candidate_id": "baseline",
    "lever_count": 4,
    "mutation_count": 3,
    "latest_version": 4
  },
  "lever_versions": {
    "mipro.prompt.sys_abc": 4
  },
  "best_lever_version": 4,
  "sensor_frames": [
    {
      "frame_id": "frame_01hzk...",
      "created_at": "2026-02-12T18:44:00Z",
      "sensor_count": 3,
      "sensor_kinds": ["rollout", "reward", "resource"],
      "trace_ids": ["trace_abc"],
      "lever_versions": {
        "mipro.prompt.sys_abc": 4
      }
    }
  ],
  "history": [
    {"generation": 1, "best_reward": 0.72},
    {"generation": 2, "best_reward": 0.85},
    {"generation": 3, "best_reward": 0.94}
  ]
}