Linux:
- numa install: backs up /etc/resolv.conf, sets nameserver to 127.0.0.1
- numa uninstall: restores original /etc/resolv.conf from backup
- numa service start: installs systemd unit, enables + starts
- numa service stop: stops, disables, removes unit file
- numa service status: shows systemctl status
macOS: launchd plist (already working)
Both platforms: Restart=always / KeepAlive=true for crash recovery.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
