changelog.d/4996-api-race-alarm.md

Rama main · réplica de lectura del repositorio original.

- **CI: the internal/api race budget alarm is measured on the metric it checks (#4996).** The combined-duration report now has its own measured baseline (median 4166 s over 46 main push runs) and an explicit 5200-second alarm; the 2300-second unsplit package runtime only sets the per-partition and bootstrap hang deadlines. Race instrumentation, coverage checks, timeouts, job caps and the CLI budget are unchanged, and exceeding the alarm still fails main pushes.