{
  "version": 1,
  "written_before_measurement": true,
  "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": "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."
}