{
  "schema": "method-lab-study/2",
  "status": "benefit_not_demonstrated",
  "acceptance_passed": false,
  "promotion": "not_promoted",
  "winner": {
    "fitness": {
      "maximum_fuel_ratio": 0.9842187775782053,
      "maximum_length_ratio": 1.0,
      "mean_fuel_ratio": 0.9542839749980988,
      "mean_length_km": 394.2573899897856,
      "mean_length_ratio": 1.0,
      "selection_objective": 1.0,
      "total_fuel": 4471542
    },
    "program": {
      "score": {
        "op": "constant",
        "value": -1.0
      },
      "version": 1
    },
    "program_sha256": "c925c9ecd889846b5de6187d5168eb901cc1d971a9b3429d2e56645f21146ce4",
    "simplification": {
      "compiled_program_sha256": "6a7281e5fe0dfecf06c9493072859b721e5e07f9bafb6ceed31dfeb129ad8ff3",
      "executed_node_count": 1,
      "original_node_count": 1,
      "original_program_sha256": "c925c9ecd889846b5de6187d5168eb901cc1d971a9b3429d2e56645f21146ce4",
      "required_features": [],
      "simplifier_version": "1.0.0"
    },
    "trial_index": 12
  },
  "train_cases": 96,
  "held_out_cases": 96,
  "metrics": {
    "mean_length_ratio_vs_nearest": 1.0,
    "worst_length_ratio_vs_nearest": 1.0,
    "mean_length_ratio_vs_insertion": 0.9614471456052882,
    "median_full_time_ratio_vs_nearest": 1.4592381995710784
  },
  "diagnostics": {
    "audit_failures": [],
    "candidate_median_of_case_medians_ms": 0.033123,
    "nearest_median_of_case_medians_ms": 0.0251885,
    "v2_distance_median_of_case_medians_ms": 0.033714,
    "diagnostic_cases_complete": 96
  },
  "gates": {
    "all_routes_valid_and_complete": true,
    "mean_length_ratio_vs_nearest_at_most_0.99": false,
    "worst_length_ratio_vs_nearest_at_most_1.1": true,
    "mean_length_ratio_vs_insertion_at_most_1.0": true,
    "median_full_time_ratio_vs_nearest_at_most_2.0": true
  },
  "winner_lock_sha256": "c9ba87ad26e427c2fb2815e41713416060d4d16aee55fcfe0fb485d24a680601",
  "validation_sha256": "9c140b9b35e8d94b90ece4380a4334cce02f9ed021a786d25c1d121c91714f02",
  "limits": "Predeclared empirical gates, not a statistical significance test or a universal guarantee. Every warmup and timed repetition must return a complete converged tour; bounded interruption fails acceptance. Up to 10 percent individual length regression is permitted, so passing is not improvement of every case. Experimental reuse is distinct from acceptance or automatic promotion.",
  "semantic_class": "nearest_neighbor_equivalent",
  "cumulative_campaigns": 2,
  "cumulative_attempts": 4352,
  "cases": [
    {
      "errors": [],
      "id": "held-uniform-16-r0",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.8856980381006538,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-16-r1",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.7420237010027344,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-24-r0",
      "length_ratio_vs_insertion": 0.8898558545552981,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.8542780748663104,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-24-r1",
      "length_ratio_vs_insertion": 1.0153944259089092,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4697674418604652,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-32-r0",
      "length_ratio_vs_insertion": 0.8855696323687468,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.695575842696629,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-32-r1",
      "length_ratio_vs_insertion": 0.9611528481762524,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4341856984839612,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-48-r0",
      "length_ratio_vs_insertion": 0.9225905767068258,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3718256130790192,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-48-r1",
      "length_ratio_vs_insertion": 0.8906096662180463,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2694878231669546,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-64-r0",
      "length_ratio_vs_insertion": 0.9119196920430852,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5052519877581778,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-64-r1",
      "length_ratio_vs_insertion": 0.9372930697793501,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3818145926323986,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-96-r0",
      "length_ratio_vs_insertion": 0.9545922903976816,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2567695601132518,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-uniform-96-r1",
      "length_ratio_vs_insertion": 0.8966752086542894,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3061384815038257,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-16-r0",
      "length_ratio_vs_insertion": 1.0106991162376855,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.9549259497746296,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-16-r1",
      "length_ratio_vs_insertion": 0.9214199015532455,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.0579561042524004,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-24-r0",
      "length_ratio_vs_insertion": 1.0229938776049534,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.579609756097561,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-24-r1",
      "length_ratio_vs_insertion": 1.023627515995702,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3966237810374498,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-32-r0",
      "length_ratio_vs_insertion": 0.9704037067142902,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4787137681159421,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-32-r1",
      "length_ratio_vs_insertion": 0.9782937150928889,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3608212063305405,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-48-r0",
      "length_ratio_vs_insertion": 0.975289323787956,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2882025274359825,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-48-r1",
      "length_ratio_vs_insertion": 0.9828951764230496,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3333333333333335,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-64-r0",
      "length_ratio_vs_insertion": 0.9640642144518757,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.440355455250723,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-64-r1",
      "length_ratio_vs_insertion": 1.0084415477441948,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3376613007854214,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-96-r0",
      "length_ratio_vs_insertion": 0.9372278391856655,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3344164538034073,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-clusters-96-r1",
      "length_ratio_vs_insertion": 0.9296170841221287,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2209473494199512,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-16-r0",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.341463414634146,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-16-r1",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.9625701809107923,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-24-r0",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.0557239449755187,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-24-r1",
      "length_ratio_vs_insertion": 0.9906297985981363,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.089533093894305,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-32-r0",
      "length_ratio_vs_insertion": 0.6960725272525342,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.579125455491931,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-32-r1",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.63782281205165,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-48-r0",
      "length_ratio_vs_insertion": 0.7286954775455433,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.318204091632978,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-48-r1",
      "length_ratio_vs_insertion": 0.7291843864113909,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.958408942440299,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-64-r0",
      "length_ratio_vs_insertion": 0.778230610708633,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3042978662283151,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-64-r1",
      "length_ratio_vs_insertion": 0.7275711697205232,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3574018771331058,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-96-r0",
      "length_ratio_vs_insertion": 0.8493251227771115,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.274351639504245,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-ring-96-r1",
      "length_ratio_vs_insertion": 0.8718000590356363,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3013025470697694,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-16-r0",
      "length_ratio_vs_insertion": 1.017291814792469,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.0431342521694744,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-16-r1",
      "length_ratio_vs_insertion": 0.9478981126923313,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.301592920353982,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-24-r0",
      "length_ratio_vs_insertion": 0.9875124790428711,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.8856866537717603,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-24-r1",
      "length_ratio_vs_insertion": 0.9623600444232077,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6842907981698017,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-32-r0",
      "length_ratio_vs_insertion": 1.015360776329399,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5673446948873007,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-32-r1",
      "length_ratio_vs_insertion": 0.9623675149622489,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2285691805342462,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-48-r0",
      "length_ratio_vs_insertion": 0.9632448190701853,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3695701500063027,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-48-r1",
      "length_ratio_vs_insertion": 0.9844443907335132,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3684294615753312,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-64-r0",
      "length_ratio_vs_insertion": 0.9671872473942794,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3068067649028803,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-64-r1",
      "length_ratio_vs_insertion": 0.9757379473718276,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3375716978861658,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-96-r0",
      "length_ratio_vs_insertion": 0.9565224380172447,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4319898294493467,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-grid-96-r1",
      "length_ratio_vs_insertion": 0.9525462324648063,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2907982078906755,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-16-r0",
      "length_ratio_vs_insertion": 1.018009933435183,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4861524376287483,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-16-r1",
      "length_ratio_vs_insertion": 0.9998305743162332,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6652739090064996,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-24-r0",
      "length_ratio_vs_insertion": 0.9219634641225786,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.2180700880252453,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-24-r1",
      "length_ratio_vs_insertion": 1.0086998347800629,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.705518697225573,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-32-r0",
      "length_ratio_vs_insertion": 1.0109295325343035,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.450561490002739,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-32-r1",
      "length_ratio_vs_insertion": 0.9563595671071862,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5394325290437891,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-48-r0",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2550390043739008,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-48-r1",
      "length_ratio_vs_insertion": 1.0006245489248085,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.7817888211699746,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-64-r0",
      "length_ratio_vs_insertion": 0.9823771885800598,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5334265415014123,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-64-r1",
      "length_ratio_vs_insertion": 1.0310638202732654,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6786323554145943,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-96-r0",
      "length_ratio_vs_insertion": 0.9529695807136254,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5051624276001008,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-corridors-96-r1",
      "length_ratio_vs_insertion": 0.9615402556677843,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.454556036371604,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-16-r0",
      "length_ratio_vs_insertion": 0.9783774375024713,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6098035745885684,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-16-r1",
      "length_ratio_vs_insertion": 0.9760991553113147,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6198252069917205,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-24-r0",
      "length_ratio_vs_insertion": 0.9767154856196997,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4745111337176442,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-24-r1",
      "length_ratio_vs_insertion": 0.9910375079451168,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.649414664202095,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-32-r0",
      "length_ratio_vs_insertion": 0.9884406954985491,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.8925686591276254,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-32-r1",
      "length_ratio_vs_insertion": 0.9873348516563811,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.24725538905361,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-48-r0",
      "length_ratio_vs_insertion": 0.9911506123238636,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.657213732275748,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-48-r1",
      "length_ratio_vs_insertion": 1.0335399706416448,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3427328391878828,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-64-r0",
      "length_ratio_vs_insertion": 1.0348230904670592,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4639203627705526,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-64-r1",
      "length_ratio_vs_insertion": 1.0217033114697642,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4884308928644645,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-96-r0",
      "length_ratio_vs_insertion": 0.96495172498392,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.358743453183355,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-outliers-96-r1",
      "length_ratio_vs_insertion": 0.9454993506461904,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3349818126990713,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-16-r0",
      "length_ratio_vs_insertion": 0.997942705847777,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.490767587364566,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-16-r1",
      "length_ratio_vs_insertion": 0.9976228365349866,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.6979620275213378,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-24-r0",
      "length_ratio_vs_insertion": 0.9970924708400551,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3556246115599753,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-24-r1",
      "length_ratio_vs_insertion": 1.0,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3740952380952383,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-32-r0",
      "length_ratio_vs_insertion": 0.9991437464736144,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.33281665190434,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-32-r1",
      "length_ratio_vs_insertion": 1.0011429041078388,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3928447226569292,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-48-r0",
      "length_ratio_vs_insertion": 0.9895518722225379,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3937744301854464,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-48-r1",
      "length_ratio_vs_insertion": 0.9897878793809459,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2572982461188726,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-64-r0",
      "length_ratio_vs_insertion": 0.9842751425153927,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2104058042980497,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-64-r1",
      "length_ratio_vs_insertion": 1.002801550769258,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.2956613253666485,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-96-r0",
      "length_ratio_vs_insertion": 0.9932128556645939,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3541160436299375,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-anisotropic-96-r1",
      "length_ratio_vs_insertion": 0.9969418120079115,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.268920434852285,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-16-r0",
      "length_ratio_vs_insertion": 0.9991646551421367,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 2.0064298836497243,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-16-r1",
      "length_ratio_vs_insertion": 1.0065474305816906,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.687615526802218,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-24-r0",
      "length_ratio_vs_insertion": 0.955915896835376,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5860882260923979,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-24-r1",
      "length_ratio_vs_insertion": 0.9345196428210863,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.4710879428516266,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-32-r0",
      "length_ratio_vs_insertion": 0.9697058692478684,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.7916077588644457,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-32-r1",
      "length_ratio_vs_insertion": 0.9978900160415959,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.862747797356828,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-48-r0",
      "length_ratio_vs_insertion": 0.9804280738694283,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.5565997519764379,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-48-r1",
      "length_ratio_vs_insertion": 1.0104038316501778,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3208307286240188,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-64-r0",
      "length_ratio_vs_insertion": 0.8713664447294112,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3712744212577839,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-64-r1",
      "length_ratio_vs_insertion": 0.9729581081007997,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.3154868808382663,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-96-r0",
      "length_ratio_vs_insertion": 0.9016274103431456,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.262308508314873,
      "valid": true
    },
    {
      "errors": [],
      "id": "held-duplicates-96-r1",
      "length_ratio_vs_insertion": 0.960232074792965,
      "length_ratio_vs_nearest": 1.0,
      "median_time_ratio_vs_nearest": 1.1921677474494772,
      "valid": true
    }
  ],
  "search": {
    "attempted": 4096,
    "baseline_program_sha256": "004951a80dc16d14b4be1f37c96feedd38b6f3682acb9d9cfa5e875a76fb6fe8",
    "budget": {
      "candidates": 4096,
      "fuel_per_case": 4000000,
      "time_per_case_ms": 1000
    },
    "contract_version": "0.2.0",
    "elapsed_ms": 67638.379036,
    "kernel_version": "1.0.0",
    "limitations": [
      "Training-only search; exactly one selected AST; no held-out API or automatic promotion.",
      "Version-1 grammar: five features, five operators, seven constants, depth four, at most 31 executable nodes; rejected crossover proposals remain journaled.",
      "Selection objective is mean training length ratio plus declared penalty times max(0,mean fuel ratio-1); ties use worst length ratio,total fuel,executed nodes,original nodes,index.",
      "Fuel includes complete v2 execution and extra direct-coordinate verification; it is a logical work proxy, not CPU cycles or measured runtime.",
      "All fitness requires every baseline and candidate case to be independently verified and heuristic_converged; cutoff tours remain journaled without eligible fitness.",
      "Enumerated grammar expressions seed bounded populations; point/subtree mutation and crossover produce new expressions. Structural novelty alone does not establish utility.",
      "Reused trials retain original case measurements and reference the prior trial; attempts, duplicates and invalid proposals are counted without retry.",
      "Wall-clock time never ranks candidates, but cooperative timeouts can alter completed outcomes and hence later parent selection.",
      "Caller must seal request/source/corpus before execution, persist the full journal, and enforce the overall search deadline. Offline limits do not change public v1 limits."
    ],
    "promotion": "not_promoted",
    "request_sha256": "5a7ab90d62c15c3f19b32b41c177ef4fb3224d558dbb0e8ae8aa6c60d0f4b936",
    "search_version": "1.0.0",
    "seed": 962041,
    "selected": {
      "fitness": {
        "maximum_fuel_ratio": 0.9842187775782053,
        "maximum_length_ratio": 1.0,
        "mean_fuel_ratio": 0.9542839749980988,
        "mean_length_km": 394.2573899897856,
        "mean_length_ratio": 1.0,
        "selection_objective": 1.0,
        "total_fuel": 4471542
      },
      "program": {
        "score": {
          "op": "constant",
          "value": -1.0
        },
        "version": 1
      },
      "program_sha256": "c925c9ecd889846b5de6187d5168eb901cc1d971a9b3429d2e56645f21146ce4",
      "simplification": {
        "compiled_program_sha256": "6a7281e5fe0dfecf06c9493072859b721e5e07f9bafb6ceed31dfeb129ad8ff3",
        "executed_node_count": 1,
        "original_node_count": 1,
        "original_program_sha256": "c925c9ecd889846b5de6187d5168eb901cc1d971a9b3429d2e56645f21146ce4",
        "required_features": [],
        "simplifier_version": "1.0.0"
      },
      "trial_index": 12
    },
    "selection": {
      "maximum_case_fuel_ratio": null,
      "maximum_executed_nodes": 31,
      "maximum_mean_fuel_ratio": null,
      "maximum_training_length_ratio": 1.1,
      "mean_fuel_penalty": 0.01
    },
    "stop_reason": "candidate_budget_exhausted",
    "train_sha256": "7013c05dcdd212204d65a4b97f72120f3df683bd27ac502c1d14cc66bbdb5cd0",
    "unique_evaluated": 1647
  },
  "links": {
    "protocol": "/research/method-lab-v2/protocol.json",
    "evidence": "/research/method-lab-v2/reproducible-study.tar.gz",
    "ledger": "/research/method-lab-v2/ledger.jsonl.gz",
    "report": "/research/method-lab-v2/report.md",
    "reproduce": "/research/method-lab-v2/reproduce.md"
  },
  "evidence_sha256": "85b86293703d6109afb3b50ae3173e8c9d8646376dfe609a244e11463fd47720",
  "evidence_bytes": 13473776,
  "ledger_sha256": "c360e0ba6d278add88b3518ee25bf4a80dd254e7213572349acd3441c5d97bdd"
}