Merged into release/v3.8.45. CI merge-integrity fast-gates (changelog-integrity + agent-skills-sync) + pre-flight hermetic mode. O gate novo detectou 11 SKILL.md gerados fora de sync (drift pré-existente no tip: omni-api-keys endpoints, omni-github-skills do #6186) — regenerados neste PR, Merge-integrity GREEN no CI. Reds restantes base-red (dast-smoke/file-size drift/live-data flaky). Testes novos 17/17.
Integrated into release/v3.8.8. Applied review fixes: moved the SELECT 1 into a pingDb() db helper (no raw SQL in route, Hard Rule #5) + the 503 catch no longer leaks err.message (Hard Rule #12). Thanks @herjarsa!