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   [
    2.0,
    4.0
   ],
   [
    1.0,
    0.0
   ],
   [
    3.0,
    5.0
   ],
   [
    1.0,
    5.0
   ],
   [
    3.0,
    3.0
   ],
   [
    2.0,
    0.0
   ],
   [
    0.0,
    2.0
   ],
   [
    3.0,
    6.0
   ],
   [
    4.0,
    4.0
   ],
   [
    0.0,
    1.0
   ],
   [
    2.0,
    5.0
   ],
   [
    2.0,
    4.0
   ],
   [
    2.0,
    0.0
   ],
   [
    0.0,
    1.0
   ],
   [
    4.0,
    0.0
   ]
  ],
  "layers": 2,
  "interaction_radius": 6.7083,
  "contributed_by": {
   "by": [
    "@dorakingx"
   ],
   "date": "2026-10-02",
   "method": "Simulated annealing over site assignments on an integer grid with the repo's own research/local2d/fold_layout.search_layout (max-diameter objective, several bounding boxes and seeds); single layer at radius 4 tried first, then two layers at 7. Radius and per-site occupancy re-measured with the verifier's rule."
  }
 }
}