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 "provenance": {
  "authors": [
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  "construction": "Two-block group-algebra code on the cyclic group Z_62 (elements indexed 0..61); supports a = [0, 59, 2] (left regular representation) and b = [0, 20, 12] (right regular representation); H_X = [L(a) | R(b)], H_Z = [R(b)^T | L(a)^T] (research/kit/group_algebra.py build_2bga).",
  "origin": "submission",
  "date": "2026-09-20",
  "model": "Claude Fable 5.1",
  "notes": "Found by a random support sweep over weight-6 two-block group-algebra codes with n <= 160 (a sweep script kept with the search run (not committed; method in the research note)). Distance is a witness-backed upper bound; surrogate ladder [(200000, 10), (1000000, 10)] trials per side. Advances the weight-6 x unrestricted board; novelty vs the literature unverified.",
  "search_budget": {
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   "wall_clock_hours": 1.0,
   "tool": "research/kit search funnel, gf2_fast RIS"
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