{
  "sourceCommit": "d3391a7",
  "kind": "existing-core-regression-benchmark",
  "observerSignalsEnabled": false,
  "nativeClientPerformanceEvidence": false,
  "latency": {
    "kind": "synthetic-injected",
    "milliseconds": 400
  },
  "records": 240,
  "holdout": [
    {
      "arm": "candidate",
      "records": 60,
      "requestedCalls": 336,
      "hits": 0,
      "joins": 146,
      "misses": 190,
      "hitRate": 0.43452380952380953,
      "speculativeCalls": 228,
      "shutdownWaste": 82,
      "wastePerUseful": 0.5616438356164384,
      "recallAt1": 0.5416666666666666,
      "recallAt3": 0.6785714285714286,
      "predictionCoverage": 0.6785714285714286,
      "toolWaitMs": 129737.44736599995,
      "meanToolWaitMs": 386.1233552559522,
      "p50ToolWaitMs": 407.06408300006296,
      "p95ToolWaitMs": 423.9367500000517,
      "upstreamCalls": 418,
      "wallTimeMs": 199232.66428499974,
      "cpuUserMicros": 525119,
      "cpuSystemMicros": 102256,
      "peakStateBytes": 29701
    },
    {
      "arm": "off",
      "records": 60,
      "requestedCalls": 336,
      "hits": 0,
      "joins": 0,
      "misses": 336,
      "hitRate": 0,
      "speculativeCalls": 0,
      "shutdownWaste": 0,
      "wastePerUseful": null,
      "recallAt1": null,
      "recallAt3": null,
      "predictionCoverage": null,
      "toolWaitMs": 138036.95228900033,
      "meanToolWaitMs": 410.82426276488195,
      "p50ToolWaitMs": 408.6166250000242,
      "p95ToolWaitMs": 426.84866700007115,
      "upstreamCalls": 336,
      "wallTimeMs": 206740.7486260001,
      "cpuUserMicros": 507290,
      "cpuSystemMicros": 89338,
      "peakStateBytes": 0
    }
  ],
  "measuredAggregateToolWaitImprovementPercent": 6.012524027351867,
  "issuedSpeculationUnusedPercent": 35.96491228070175,
  "interpretation": "Existing Speculate versus no prediction, using injected fixture latency. Results validate the reviewed core; they do not measure new observer benefit. Historical and current runs have identical join/miss/issue/waste counts."
}