imccyu ea6eb85162 fix(ci): review follow-ups for the coverage lane split ...

- Split DSH_COVERAGE_MAX_WORKERS between the two parallel gates
  (instrumented gets ~2/3, exempt gets ~1/3, both at least 1) so the
  lane never exceeds the budget the failover pool's 8 x 6-instance
  bound assumes; a budget of 1 pairs with DSH_GATE_CONCURRENCY=1 on
  the serial reference lanes, which already prevents gate overlap.
- Fail loud on a set-but-not-'1' DSH_COVERAGE_EXEMPT_HEAVY value in
  vitest.config.ts instead of silently ignoring it.
- Add coverage-exempt.spec.ts: each roster entry's filter and exclude
  must select the same non-empty spec set and entries must not
  overlap, so a renamed suite breaks the gate instead of silently
  returning to the instrumented run with a stale roster.

2026-07-31 02:55:37 +08:00

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