v1: Placed consecutive neighbors
v2: Valid adjacent positions (≤2 = LIKELY)
LIKELY → Find the shape:
● Lock — forced step
◐ Signal — fork eliminated
═ Beam — corridor forces
◈ Resonance — path convergence
⟶ Vision — path search
Mistake Budget:
Easy: 6 | Med: 5 | Hard: 4 | Expert: 3