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 "provenance": {
  "authors": [
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  "construction": "graft_r1_safe removal of 2 qubits from codes/50-6-3.json (seed 0, d_floor 3 defended at the tool's per-step 2-seed confirms and 3-removal block gates); layout subset to the 48 surviving qubits.",
  "references": [],
  "date": "2026-09-09",
  "notes": "Derived from codes/50-6-3.json by r=1 lattice graft (2 stabilizer rows removed, 2 qubit columns deleted; k unchanged, n lower). Different check sets; checked, not equivalent.",
  "model": "Omen Alpha 1.0"
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