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- 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>