Replaces the capped-EMEX-then-sequential-PL24 fallback (incl. the Phase-3 8s EMEX
cap) with a dynamic first-definitive race. PCAT + EMEX fire in parallel; the
instant PCAT settles without a single car, PL24 joins the race (a definitive EMEX
would already have returned). Whichever source yields a definitive result FIRST
wins — no artificial wait. At the parts counter the dealer gets the OEM match as
fast as any one source can answer.
- Removes EMEX_RACE_MS (reverts the 8s cap from 9b13c4a).
- PL24 still gated by isDecodeable + circuit breaker, raced against the 25s budget.
- Preserves Phase-1 transient tagging (no negative-cache poisoning), ctx timings,
and the candidate fallback.
- Adds race tests: PCAT-1-car wins (no PL24); PCAT-miss + EMEX vehicle;
PCAT-miss + EMEX-miss -> PL24 wins; all-miss -> throws.
Supersedes the Phase-3 EMEX-cap approach.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Semih Yesilyurt
f5e4de2aab