Layer Density: tile distribution across zones
Strand Risk: buried matchless tiles
WSRF 5 Shapes:
\u25CF Lock — free safe pair
\u25D0 Signal — unblocking pair
\u2550 Beam — same-layer pair
\u25C8 Resonance — cross-layer pair
\u27F6 Vision — strategic best
Zone Bar:
Layer density across 5 zones