fix(install): klonkt-update no longer restarts (or claims "updated") when already current
klonkt-update always ran systemctl restart klonkt and printed "Klonkt updated" even
when the fetched commit equalled the current one — a needless restart and a misleading
message on every run. It now exits early with "already up to date" when HEAD is unchanged.
- scripts/install.sh — the generated /usr/local/bin/klonkt-update bails out before the
npm/restart steps when $B == $A (no new commit)
Co-Authored-By: Claude <noreply@…>