{
  "schemaVersion": "fidc-numeric-vm-binding-generation-rejection/v1",
  "measuredAt": "2026-09-06T05:36:00+08:00",
  "host": "192.168.31.177",
  "baseline": {
    "engineCommit": "5f08978",
    "primaryFiveYearHotMedianEngineSeconds": 2.629,
    "primaryFiveYearTotalReturn": 0.9219861819172002,
    "primaryFiveYearTradeCount": 26088,
    "primaryCanonicalSha256": "b42fea66237d06eadb24f6b8c9e2760e7319fe3699f315b99e01f433ef2aa234",
    "primaryResultStoreSha256": "9ccf0c0fc6f5d72e974381ad4cd09a80241d7de99f2649f2b01736f7c80dc2c7",
    "profileInstructions": 16600366059,
    "profileBranches": 2592214949
  },
  "compileTimeIdentifierBinding": {
    "engineCommit": "2135a5b",
    "implementation": "map every numeric VM identifier to a typed runtime enum during expression plan compilation",
    "primaryFiveYearHotEngineSeconds": [2.608, 2.624, 2.651, 2.619, 2.781],
    "primaryFiveYearHotMedianEngineSeconds": 2.624,
    "observedMedianImprovementPercent": 0.190186,
    "profileInstructions": 16360894880,
    "instructionReductionPercent": 1.442566,
    "secondaryFiveYearResultConsistent": true,
    "secondaryFiveYearPerformanceExcluded": true,
    "secondaryFiveYearExclusionReason": "the symbolic campaign entered a high-memory-bandwidth phase between the primary and secondary batches",
    "netCodeLinesAdded": 562,
    "retained": false
  },
  "generationStampedScratchSlots": {
    "engineCommit": "5122c73",
    "implementation": "invalidate numeric VM variable and local slots with a generation counter instead of clearing Option arrays for each evaluation",
    "localReleaseBenchmark": {
      "baselineVmNanosecondsPerEvaluation": 86.992,
      "candidateSamples": [83.284, 94.166, 86.275, 84.138, 85.453],
      "candidateMedianNanosecondsPerEvaluation": 85.453,
      "componentImprovementPercent": 1.769136,
      "comparisonStrength": "weak because the baseline contains one sample"
    },
    "primaryFiveYearHotEngineSeconds": [2.634, 2.636, 2.608, 2.642, 2.710],
    "primaryFiveYearHotMedianEngineSeconds": 2.636,
    "observedMedianRegressionPercent": 0.266261,
    "profileInstructions": 16521146700,
    "instructionReductionPercent": 0.477215,
    "netCodeLinesAdded": 39,
    "retained": false
  },
  "hostLoad": {
    "symbolicWorkersObserved": 3,
    "symbolicWorkerCpuPercentApproximate": [720, 718, 698],
    "symbolicWorkerRssBytesApproximate": [54479982592, 53353455616, 53941170176],
    "wallTimeComparisonsAcrossPhasesExcluded": true
  },
  "testGate": {
    "workspacePassedBeforeFirstCandidateRejection": 539,
    "workspacePassedForGenerationCandidate": 540,
    "failed": 0,
    "ignoredManualBenchmarks": 8
  },
  "remoteArtifacts": [
    "/srv/fidc/canonical/run/fidc-private/evidence/goal-primary-five-year-20260906.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/identifier-binding-primary-five-year-20260906.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/identifier-binding-secondary-five-year-20260906.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/identifier-binding-candidate-perf-stat-20260906.csv",
    "/srv/fidc/canonical/run/fidc-private/evidence/identifier-binding-rollback-primary-five-year-20260906.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/identifier-binding-rollback-perf-stat-20260906.csv",
    "/srv/fidc/canonical/run/fidc-private/evidence/vm-generation-primary-five-year-20260906.json",
    "/srv/fidc/canonical/run/fidc-private/evidence/vm-generation-candidate-perf-stat-20260906.csv"
  ],
  "decision": {
    "status": "rejected_and_removed",
    "reason": "both candidates preserved exact business results but failed to produce a material, stable end-to-end improvement; the typed binding added disproportionate code and the generation slots slightly regressed the five-year median",
    "nextTarget": "profile and specialize the numeric VM instruction dispatch or runtime helper execution without changing expression, PIT, or lazy short-circuit semantics"
  }
}