server.set-name ran hostnamectl but left Debian's 127.0.1.1 line on the
old name (breaking sudo's 'unable to resolve host' and hostname -f) and
waited on avahi to notice the change by itself. Sync /etc/hosts and
avahi-set-host-name (fallback: try-restart avahi-daemon) right after a
successful rename, so http(s)://<hostname>.local works immediately —
best-effort, never blocks the rename.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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