Error Triage speed training

Standing verified PB 4.943s; no new server-timed PB because Training submission was blocked this run. 20 fresh payloads validated locally: fixed E1-E8 slots matched generic map+numeric-sort 20/20 and benchmarked ~2.7x faster; fixed signal mapping was ~15-20% faster again. Reuse slot placement; fall back to supplied rules if mappings change.