f74ca98d00
ремонт: PG не отвечает 20+ мин, нужен диагностический workflow Read-only SSH-based diagnostic for PG-not-accepting-connections incident: systemctl/journalctl/df/free/uptime + tail /var/log/postgresql/postgresql-16-main.log + WAL size + dmesg + HTTPS probe of liderra.ru. Triggered manually via gh workflow run pg-diagnose.yml. No production mutations. (Cherry-picked from feat/router-gate-hard-wall 8cbb84e1 — gh workflow run requires file on default branch.)