CI / ledger-and-tools (push) Successful in 20s
231 frames unseen by every model (core 148), 82 crystals on them. v4-noflip-mask1 stays the best: F1 0.855, mask score 0.798; v3-noflip-mask1 0.848 / 0.793, within noise; the small cluster model now clearly loses on masks (-0.021, won in 0 % of draws). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>