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  "construction": "Cyclic generalized-bicycle code on the ring x^41 - 1 with a(x) = 1 + x, b(x) = 1 + x^9; H_X = [circ(a) | circ(b)], H_Z = [circ(b)^T | circ(a)^T]. Found by exhaustive enumeration of the weight-4 cyclic GB family quotiented by monomial shifts, the unit map x -> x^u for u coprime to m, and the a/b swap.",
  "origin": "submission",
  "date": "2026-09-20",
  "model": "Claude Opus 5"
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