{
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  "timestamp": "2026-04-14T20:02:20.820321+00:00",
  "source_trajectory_ids": [
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  "sample_count": 10,
  "baseline_metrics": {
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    "avg_reward": 1.032,
    "error_rate": 0.0,
    "avg_latency_ms": 42.0
  },
  "challenger_metrics": {
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    "avg_reward": 0.44,
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    "avg_latency_ms": 0.0
  },
  "promotion_decision": {
    "accepted": true,
    "reasons": [],
    "metrics": {
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      "error_rate_delta": 0.0,
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      "baseline_avg_reward": 1.032,
      "challenger_avg_reward": 0.44
    }
  },
  "promoted_version_id": "20260414-200220",
  "baseline_version_id": "v-baseline",
  "dry_run": false
}