Confluent epithelial sheet at scale
The substrate every mechanism runs on — geometry + throughput
0.3 mm² confluent sheet
900 cells
mean volume (target 25)
25.0 sites/cell
throughput — clears 200 floor
406–422 MCS/s
The Increment-1 substrate: a confluent epithelial tiling on a 150×150 lattice (900 five-by-five cells), each patch a distinct tile above. Geometry holds (mean volume 25.0 vs the target 25) and 1 mm² throughput (406–422 MCS/s across 4 runs) clears the 200 MCS/s feasibility floor. Substrate only — no biology yet.