{
  "schema": 1,
  "measured_source_commit": "f85d1f15d241821bb522d35c077db993cee4f5c2",
  "phase": {
    "id": 6,
    "title": "Multi-source Cast execution",
    "status": "Correct \u00b7 R4 not promoted",
    "state": "validated",
    "detail": "Two-source broadcast join and grouped reducers:7/7 exact outputs on four loopback workers. Four reducers used3.70% less time, missing the preset5% benefit gate. One reducer is the default.",
    "decision": {
      "schema": "phase6-fixed-screen-decision-v1",
      "utc": "2026-10-29T10:37:59.691995+00:00",
      "all_seven_exact": true,
      "primary_statistic": "median of two within-pair R4/R1 full-command wall ratios",
      "within_pair_ratios": [
        0.9526617154831873,
        0.9734361670106646
      ],
      "median_pair_ratio": 0.963048941246926,
      "latency_change_percent": -3.695105875307403,
      "nonregression_limit_ratio": 1.05,
      "benefit_limit_ratio": 0.95,
      "nonregression_pass": true,
      "speed_benefit_pass": false,
      "r4_speed_promotion": false,
      "multi_source_capability_remains_opt_in": true,
      "recommended_explicit_reducers": 1,
      "decision": "Functional capability passes this exact integer screen. R4 passes the small nonregression gate but misses the frozen >=5% benefit gate; do not promote an R4 speed win. Use explicit R1 unless later separate evidence supports another workload.",
      "inference": "Four timing calls/two fixed pairs, descriptive only; no statistical significance, universal speed, Photon or multihost claim.",
      "rss": "Runner/process and CLI accounting are not aggregate cluster RSS.",
      "native_jobs_launched": 7,
      "timed_primary_calls": 4,
      "retries": 0,
      "exclusions": 0,
      "cumulative_controller_seconds": 2.335671375
    },
    "scope": "Bounded-right broadcast, supported CSV graphs, inherited ordered partial-sum semantics. Two paired rounds, no retries; no two-sided shuffle or multihost/TPC claim.",
    "evidence": "/evidence/bounded-engine-20261029-phase6.json"
  }
}