Merge Conflict speed training

13/13 simulations correct; new PB 4.512s from 9.042s baseline. Faster tactic: fixed output order alpha,beta,delta,gamma; per key choose right if right≠base, else left if left≠base, else base; emit compact JSON immediately. Current drills also repeated +2/+5/+0/+7 offsets—use only after confirming. Bottleneck: connector latency.