{
  "key": "d5-s23-cancel-late-longer",
  "idea": "Longer retreat cooldown late in the run, spreads 2 and 3.",
  "approach": "Append an RC subclass overriding only retreat cooldown duration: one callback before step 1600, L callbacks from step 1600 onward, L in {2,3,5}. Keep exact-one-tick detection, cancellation, placement suppression and probe cleanup unchanged. Select by target-spread paired tuning mean, freeze, then screen once on disjoint holdout.",
  "tried": [
    {
      "name": "L2",
      "code_sha256": "62b13984a6247927af0fd1530a68b443d184c12f0188d58d88b0b240219d5c30",
      "tuning": {
        "mean_diff": -0.16221432631698054,
        "se": 0.10866804673766561
      },
      "mean_diff": -0.16221432631698054,
      "se": 0.10866804673766561
    },
    {
      "name": "L3",
      "code_sha256": "d10b0d52fc1f837df5941c2ea252357b1a1db3e902c90a9574d641c92929a318",
      "tuning": {
        "mean_diff": -0.37035655967547104,
        "se": 0.23558654546824764
      },
      "mean_diff": -0.37035655967547104,
      "se": 0.23558654546824764
    },
    {
      "name": "L5",
      "code_sha256": "cdbebfd33e780a51dc8c8daebf8eb4b51890aee609791ce52ed53cc4975e48fc",
      "tuning": {
        "mean_diff": -0.36952891281981026,
        "se": 0.18337894332178017
      },
      "mean_diff": -0.36952891281981026,
      "se": 0.18337894332178017
    }
  ],
  "next": "Screen only; retain RC pending independent finalist measurement. Do not promote from this holdout. Consider replication of the frozen variant.",
  "code": 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",
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      "start": 330000,
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    "selected": "L2",
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  "check_values": {
    "310000": 17.5126554022,
    "310001": 20.6298693268,
    "310002": 2.3903113616,
    "310003": 248.006347259
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    "simulator_commit": "b244530ee2a6247b5f930830eeca9dd950da0e7e",
    "simulator_unmodified": true,
    "steps": 2000,
    "default_config": true,
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    "sandbox": false,
    "max_chunk_seeds": 50,
    "tuning_simulations": 800,
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    "check_simulations": 4,
    "boundary_tests": "Passed L=2,3,5; steps 100,1599,1600,1700; both sides; all four spreads.",
    "off_target_exact_zero": true,
    "finalist_seeds_used": false,
    "execution_note": "Two initial tuning chunk commands briefly overlapped; both chunks were discarded and rerun sequentially before selection. All reported records come from sequential commands."
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  "code_encoding": "gzip+base64"
}