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 "provenance": {
  "authors": [
   "Liang, Zijian",
   "Eberhardt, Jens Niklas",
   "Chen, Yu-An"
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  "origin": "baseline",
  "construction": "Liang-Eberhardt-Chen k=6 family f=1+x+x^-1y^-2, g=1+y+xy^-1; (6,8) open-boundary lattice.",
  "references": [
   "arXiv:2504.08887"
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  "date": "2025-04-11",
  "notes": "Reference baseline (Liang, Eberhardt, Chen). Bilayer grid layout added 2026-07-23, recovered from the check structure by template matching: the 18+24 weight-6 bulk checks are translated copies of (f, g), which pins 84 of 88 qubits on the two-layer grid; the 4 notch-boundary qubits were placed by exhaustive local search. Measured interaction radius sqrt(10). Layout shear-optimized 2026-07-23: linear map [[1.000000,-0.318933],[0.000000,0.968940]] applied to the template-solved grid with the 4 notch-boundary qubits re-placed in the sheared lattice, reducing the interaction radius sqrt(10) -> 3.0; same code, same check matrices."
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