A `nomarchy-menu printers` entry opens system-config-printer (the CUPS
admin GUI), mirroring the bluetooth/blueman pattern: the printing service
ships the package via environment.systemPackages and the menu execs it,
self-gated on the system-config-printer binary so the entry appears only
when nomarchy.services.printing is on. No direct keybind (rare one-off).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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