Enable the p2p watcher alongside the existing probe. Peers are discovered
via DNS name peers.hectic-lab.com. TG credentials are loaded from a SOPS
secret sentinèlla/watcher/environment (to be populated with TG_TOKEN and
TG_CHAT_ID).
- Replace central sentinel with watcher: each node polls peers discovered
via a single DNS name with multiple A records (e.g. peers.sentinella.com)
- Auto-detect own IPs via hostname -I; SELF env var available as optional
override for NAT/floating-IP setups
- Fix Basic Auth bug in router.sh: compare tok against AUTH_TOKENS instead
of unset $USER/$PASS
- Rename sentinel binary to watcher; drop unused shellplot dep
- Add inetutils to watcher runtime deps for hostname -I
- Update NixOS module: replace sentinel options with watcher p2p options
(peersDns, self, peersPort, peersScheme, pollingIntervalSec)
- Add sentinèlla test suite: probe-status-empty, probe-disk, watcher-state-file
