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    218
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   [
    89,
    102,
    154,
    186,
    212,
    219
   ],
   [
    90,
    103,
    155,
    187,
    213,
    220
   ],
   [
    91,
    104,
    156,
    201,
    221,
    227
   ],
   [
    92,
    105,
    157,
    202,
    222,
    228
   ],
   [
    93,
    106,
    158,
    203,
    223,
    229
   ],
   [
    94,
    107,
    159,
    204,
    224,
    230
   ],
   [
    95,
    108,
    160,
    205,
    225,
    231
   ],
   [
    96,
    109,
    161,
    206,
    226,
    232
   ],
   [
    97,
    110,
    162,
    207,
    227,
    233
   ],
   [
    98,
    111,
    163,
    195,
    221,
    228
   ],
   [
    99,
    112,
    164,
    196,
    222,
    229
   ],
   [
    100,
    113,
    165,
    197,
    223,
    230
   ],
   [
    101,
    114,
    166,
    198,
    224,
    231
   ],
   [
    102,
    115,
    167,
    199,
    225,
    232
   ],
   [
    103,
    116,
    168,
    200,
    226,
    233
   ]
  ]
 },
 "distance": {
  "d": 7,
  "X": {
   "value": 7,
   "confidence": "exact",
   "witness": [
    9,
    22,
    35,
    48,
    55,
    68,
    178
   ]
  },
  "Z": {
   "value": 7,
   "confidence": "exact",
   "witness": [
    0,
    39,
    65,
    91,
    136,
    156,
    182
   ]
  }
 },
 "family": "bivariate-bicycle",
 "provenance": {
  "authors": [
   "@cbjuan"
  ],
  "construction": "Periodic bivariate-bicycle code on the group algebra Z_9 x Z_13 (n = 2*l*m = 234). Convention: x = S_9 tensor I_13, y = I_9 tensor S_13 (cyclic shifts), qubit index = i*m + j; A = 1 + x^0y^7 + x^2y^7 + x^5y^0, B = 1 + x^1y^0; H_X = [A|B], H_Z = [B^T|A^T]. Found by an automated evolutionary/mutation search over (l, m, A, B) exponent sets targeting the unrestricted x weight-6 (or weight-8) board cells, screened by a randomized lightest-logical surrogate and promoted through increasing trial budgets.",
  "origin": "submission",
  "date": "2026-09-16",
  "notes": "Internal autoresearch candidate id 20918 (canonical key 56134fef1933d3ee59cc338a), search lane 'targeted-mutation', proposal kernel 'nearby-geometry'. Initial NumPy lightest-logical surrogate: trials=8000, seed=1591394722. Confirmed with an accelerated bit-packed random-information-set search at rung '60k' (60000 trials, seed=1591394739, pair_depth=16), tightest witness on side X at weight 7. Distance also taken through an internal exact-certification pipeline (MILP, one solve per logical-basis row per side, the same method as this repository's own verify/certify.py). Result: side_status X=exact, Z=exact (solver wall time 25452.4s, CPU time 25184.2s, summed over all per-row MILP solves on both sides). Per CONTRIBUTING.md's confidence-tier policy, this 'exact' claim is self-declared and will display as an upper bound on the board until a maintainer independently re-runs verify/certify.py and confirms it."
 }
}