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  "X": {
   "value": 4,
   "confidence": "upper_bound",
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   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "model": "Claude Opus 5",
  "novelty": "known_parameters",
  "origin": "submission",
  "date": "2026-09-22",
  "construction": "Check deletion from the board entry [[120,35,4]] (codes/120-35-4.json): rows [42, 43] of H_Z removed. Dropping two independent stabiliser generators frees two logical qubits and cannot raise the distance.",
  "notes": "Found by sweeping every single-row deletion of every small board entry and keeping those that land undominated. The parent's remaining checks are unchanged."
 },
 "family": "check-deletion"
}