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 "provenance": {
  "authors": [
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  "construction": "Open-boundary directional-condensation planar bivariate-bicycle code (Liang-Eberhardt-Chen arXiv:2504.08887, flagship f=x+x^2+y^2, g=1+x^2y+x^2y^2) on a 9x9 grid; built with research/local2d/planar.build_open_directional (validated construction, greedy footnote-6 corner resolution). Distance is a Monte-Carlo upper bound from research/kit/surrogate.distance_rand, confirmed stable at 10k and 40k trials (no drop from the 3k-trial screening value).",
  "references": [
   "arXiv:2504.08887"
  ],
  "date": "2026-09-18",
  "notes": "",
  "model": "Claude Sonnet 5"
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