{
  "schema_version": 1,
  "date": "2026-09-20",
  "scope": "Seed-assignment fixture, not policy-performance evaluation",
  "source_commit": "a55f80db9aadd345dd5c3dd49118b19b776522d2",
  "baseline_commit": "943e8673e064acffe3c2a7499e2bf1490b1c4b57",
  "publication": "Locally committed repair; no source push or deployment implied",
  "source_identity": {
    "algorithm": "SHA-256 of UTF-8 source after CRLF-to-LF normalization",
    "files": {
      "src/train/genetic.c": "c5821670265556dbea0d6261cbcaedee12c28a5b51fe3315f8b56b256a05916c",
      "src/train/genetic.h": "c43949c9905afa6da54de780adbc6492f3c4d1488a3375b7a6837bfd6219ade9",
      "src/cli/main_train.c": "f996fcfc5a208f5afd7d202f1571f5defb7eac2b26864ee0b9f1fc2a03b1d94b",
      "tests/test_genetic.c": "926ca9edeea5c0c4abf93c4528e08f1b1ef4c4ea158053fcc1a1888cf7e14d42"
    }
  },
  "fixture": {
    "base_seed": 20260918,
    "episodes_per_eval": 8,
    "old_source": "943e867 src/train/genetic.c: base + episode*7 + candidate*13; no incumbent reevaluation",
    "new_source": "actual linked ga_episode_seed helper; incumbent only reevaluated after generation 0",
    "rows": [
      {
        "generation": 0,
        "role": "candidate_0",
        "old_seeds": [
          20260918,
          20260925,
          20260932,
          20260939,
          20260946,
          20260953,
          20260960,
          20260967
        ],
        "new_seeds": [
          20260918,
          20260919,
          20260920,
          20260921,
          20260922,
          20260923,
          20260924,
          20260925
        ]
      },
      {
        "generation": 0,
        "role": "candidate_1",
        "old_seeds": [
          20260931,
          20260938,
          20260945,
          20260952,
          20260959,
          20260966,
          20260973,
          20260980
        ],
        "new_seeds": [
          20260918,
          20260919,
          20260920,
          20260921,
          20260922,
          20260923,
          20260924,
          20260925
        ]
      },
      {
        "generation": 0,
        "role": "incumbent",
        "old_seeds": null,
        "new_seeds": null
      },
      {
        "generation": 1,
        "role": "candidate_0",
        "old_seeds": [
          20260918,
          20260925,
          20260932,
          20260939,
          20260946,
          20260953,
          20260960,
          20260967
        ],
        "new_seeds": [
          20260926,
          20260927,
          20260928,
          20260929,
          20260930,
          20260931,
          20260932,
          20260933
        ]
      },
      {
        "generation": 1,
        "role": "candidate_1",
        "old_seeds": [
          20260931,
          20260938,
          20260945,
          20260952,
          20260959,
          20260966,
          20260973,
          20260980
        ],
        "new_seeds": [
          20260926,
          20260927,
          20260928,
          20260929,
          20260930,
          20260931,
          20260932,
          20260933
        ]
      },
      {
        "generation": 1,
        "role": "incumbent",
        "old_seeds": null,
        "new_seeds": [
          20260926,
          20260927,
          20260928,
          20260929,
          20260930,
          20260931,
          20260932,
          20260933
        ]
      }
    ]
  },
  "verification": {
    "owner": {
      "release_tests_passed": 12,
      "debug_tests_passed": 12,
      "mutants_rejected": [
        "candidate-index",
        "stale-incumbent",
        "previous-incumbent",
        "next-incumbent"
      ]
    },
    "independent_coordinator": {
      "release_genetic_test_exit": 0,
      "debug_genetic_test_exit": 0,
      "fixture_matches_archive": true,
      "fixture_matches_independent_arithmetic": true,
      "assertions_enabled": true,
      "september18_archive_unchanged": true,
      "independent_recompilation": false
    }
  },
  "limits": [
    "Fixture calls the actual linked seed helper; old candidate seeds are reconstructed from the historical formula.",
    "An incumbent exists only after generation 0; old incumbent scores were retained rather than re-evaluated on the current batch.",
    "Fixture lists seed assignments, not episode outcomes. Full-suite and mutant results are owner evidence; the coordinator independently ran the owner-built focused binaries.",
    "No new training, policy-strength evaluation, reward ablation or held-out consumption. September 18 metrics and checkpoint remain unchanged."
  ]
}