* fix(ci): restore inherited validation failures
* perf(ci): share trusted caches and fail fast on PR test failures
* fix(ci): bound static cache and hash vitest config for knip
- Bound the rolling .turbo/cache snapshot with 7d/500MB eviction so each
trusted main save cannot accumulate history toward the GitHub limit.
- Hash vitest.config.ts in knip inputs so removing the CiTestSequencer
import invalidates the cached passing check.
- Cover both in cache-policy and task-hash regressions.
morluto