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 "provenance": {
  "authors": [
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  "construction": "Two-block group-algebra code on the abelian group Z_28 x Z_2 as built by research/kit/group_algebra.py cyclic_product(28, 2) (element tuple (i, j) at index i*2 + j); supports a = [0, 2, 7] (left regular representation) and b = [0, 4, 40] (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, 8), (1000000, 8)] trials per side. Advances the weight-6 x unrestricted board; novelty vs the literature unverified.",
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   "wall_clock_hours": 1.0,
   "tool": "research/kit search funnel, gf2_fast RIS"
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