{
  "version": 2,
  "written_before_measurement": true,
  "revision_note": "The v1 run is preserved. Before this v2 run, RSS instrumentation was corrected and a 64-slot sparse sensitivity case was added after observing different queue occupancy. This is an exploratory follow-up, not a pre-registered confirmation.",
  "seed": 20260922,
  "repeats": 5,
  "slots": 512,
  "policies": [
    {"name": "borrow", "policy": "borrow", "pool": 1},
    {"name": "copy", "policy": "copy", "pool": 1},
    {"name": "threshold2", "policy": "threshold", "ratio": 2, "pool": 1},
    {"name": "threshold4", "policy": "threshold", "ratio": 4, "pool": 1},
    {"name": "threshold8", "policy": "threshold", "ratio": 8, "pool": 1},
    {"name": "pressure", "policy": "pressure", "pool": 1},
    {"name": "project", "policy": "project", "pool": 1},
    {"name": "copy_no_pool", "policy": "copy", "pool": 0}
  ],
  "cases": [
    {"name": "sparse_slow", "shape": "sparse", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
    {"name": "sparse_slots64", "shape": "sparse", "records": 2048, "budget": 8388608, "slots": 64, "hold_us": 5000, "service_us": 20},
    {"name": "dense_slow", "shape": "dense", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
    {"name": "mixed_slow", "shape": "mixed", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
    {"name": "mixed_tight", "shape": "mixed", "records": 2048, "budget": 2097152, "hold_us": 5000, "service_us": 20},
    {"name": "sparse_fast", "shape": "sparse", "records": 2048, "budget": 8388608, "hold_us": 0, "service_us": 0}
  ],
  "expectations": [
    "Borrow retains full source allocations for small selections.",
    "Copy can add CPU and transient source plus destination memory for dense selections.",
    "A current-pressure rule need not outperform a static size rule or early projection.",
    "Pool reuse can reduce allocation calls while increasing reserved idle memory.",
    "No Pure-specific advantage, application SLO, or statistical significance is presumed."
  ],
  "comparison_rule": "Report all presets and repetitions; no post-hoc winner is called an out-of-sample tuned policy.",
  "limits": "Single FIFO local pipeline with synthetic delayed sink. No Sonic/Node/.NET benchmark, fan-out, persistent cache, generic JSON parser, external open-loop arrivals, or production SLO."
}