Add the jarld.service alias for jarl.service

systemctl restart/status jarld now work too. The package relinks a unit
enabled by an older version on upgrade, so the alias appears without
re-enabling; make uninstall removes the link.

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

CHANGELOG.md

@@ -6,6 +6,12 @@ All notable changes to Jarl are documented here. The format follows
 
 ## [Unreleased]
 
+### Added
+
+- `jarl.service` has the alias `jarld.service`, so `systemctl restart
+  jarld` works too. The alias is linked when the unit is enabled; the
+  package relinks a unit enabled by an older version on upgrade.
+
 ## [0.6.0] - 2026-10-13
 
 ### Added