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 },
 "distance": {
  "d": 10,
  "X": {
   "value": 10,
   "confidence": "upper_bound",
   "witness": [
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  },
  "Z": {
   "value": 10,
   "confidence": "upper_bound",
   "witness": [
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  }
 },
 "provenance": {
  "authors": [
   "@FarLab"
  ],
  "construction": "two-block group algebra code on ZSZ(21,6,8) (kit group_algebra Cayley-table indices): a = [0, 48, 123], b = [0, 68, 118]; H_X = [L(a) | R(b)], H_Z = [R(b)^T | L(a)^T]",
  "origin": "submission",
  "date": "2026-10-17",
  "model": "Claude Fable 5.1",
  "search_budget": {
   "candidates_screened": 600000,
   "ris_trials_per_side": 10000000,
   "cpu_hours": 8.0,
   "tool": "research/kit/search.py + gf2_fast on Brev n2d-highcpu-64"
  }
 },
 "family": "generalized-bicycle"
}