althing-seat-daemon took an outside SIGTERM on 2026-09-27 and exited 0, so
Restart=on-failure never revived it; hermes-gateway sat pull-only for five
days with a yellow verdict nobody was watching. Fixed the death mode with a
Restart=always drop-in (also on the jekyll twin, same latent bug) and added
this watchdog for every other death mode: 5-min timer, alert on the second
consecutive non-200 (~10 min sustained), re-alert at most hourly, recovery
mail on green, exit 2 distinguishes a broken alarm wire from a down seat
(backup-freshness precedent). Lifecycle exercised end-to-end against a dead
port before install.
