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  "environment": {
    "native_build": "release",
    "allocator": "default Rust system allocator",
    "host_state": "quiet; no competing build or benchmark observed during final runs"
  },
  "methodology": {
    "samples_per_case": 10,
    "warmup_seconds": 0.3,
    "measurement_seconds": 0.5,
    "fixture_setup": "Outside timing; production push on preloaded state; independent final-output validation outside timing",
    "memory_budget": "Unaccounted default operator constructors; budget-accounting/pressure-compaction costs excluded",
    "confidence_intervals": "Criterion bootstrap 95% intervals retained for means and medians; ratios are descriptive means, not ratio confidence intervals",
    "limitations": [
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      "No budget-pressure or deleting-cleanup performance inference",
      "Source suffix widths8/264; generated prefix and row number add bytes; payload null every seventh row",
      "Large cases retain16384 keys; original small-state path retains64 keys"
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    "boundary": "Production keep-first rowtime incoming batch push; watermark and checkpoint gathering outside timing"
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}