- Add common-nixos.nix (timezone, locale, git/fastfetch) imported by every
NixOS host, and laptop.nix (systemd-boot, sway, dvorak, iwd, firewall)
imported by X1 and MBP. Strip the nixos-generate-config boilerplate from
both machine configs and reduce them to host-specific settings.
- Enable the firewall on the laptops (was disabled); X1 opens 22 next to
its sshd.
- Pin nixpkgs input to github:nixos/nixpkgs/nixos-26.05 for consistency;
lock rev unchanged (still b51242d).
- Drop unused module arguments.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>