Reload guard.yaml without losing the bounties

systemctl reload guard, guard reload or SIGHUP reads the configuration
again: a watch keeps its bounties and counts under the same name and
takes its new settings at once; its source starts again only if it
changed; watches gone stop, new ones start; a file with a mistake is
refused. The Housecarl connection, state, socket and log wait for a
restart, and guard reload says so.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/systemd/guard.service

@@ -9,6 +9,8 @@ Wants=network-online.target
 
 [Service]
 ExecStart=/usr/local/bin/guard --config /etc/guard/guard.yaml run
+# systemctl reload guard: guard.yaml again, keeping the bounties.
+ExecReload=/usr/local/bin/guard --config /etc/guard/guard.yaml reload
 Restart=on-failure
 RestartSec=5s