- Create modules/services/seatd.nix for clean greetd/tuigreet login experience
- Add boot log suppression options to prevent systemd messages on login screen
- Configure kernel parameters and journald to minimize console noise
- Update both little-rascal and congenital-optimist to use new seatd module
- Ensure consistent login experience across all machines
- Maintain compatibility with existing lab tool (binary name: lab)
