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 "provenance": {
  "authors": [
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  "construction": "Two-block group-algebra (2BGA) code (Lin-Pryadko) on the non-abelian metacyclic group C_3 x| C_10 (action i -> 2^j i mod 3; kit group_algebra.metacyclic(3,10,2), element (i,j) at index i*10+j): a = {g_0, g_18, g_20} (element indices [0, 18, 20]), b = {g_0, g_3} (indices [0, 3]); H_X = [L(a) | R(b)], H_Z = [R(b)^T | L(a)^T], so every check has weight 5. Found by a screen of all |a|=3, |b|=2 supports on small non-abelian groups ranked by kd^2/n; layout by simulated annealing on integer grid sites, <= 2 qubits per site.",
  "origin": "submission",
  "date": "2026-09-02",
  "model": "Claude Fable 5.1",
  "notes": "Distance is a witnessed UPPER BOUND (RIS witness search, 20000 Python trials plus a 2,000,000-trial accelerator pass at packaging; earlier confirmation ladders in notes/60-4-8.md); novelty vs the literature unverified. Equivalence check: verify/validate_candidate.py dedup found no identical or WL-equivalent entry on the board. Layout: simulated annealing over integer grid sites with at most 2 qubits per site (research/local2d/fold_layout.py::anneal), 2 layers, measured interaction radius 3.6056; the verifier derives the locality class. Search driven by Claude Fable 5.1 as one lane of a multi-agent campaign."
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