nixos/modules/system/core/default.nix

{
  self,
  inputs,
  ...
}: {
  flake.nixosModules.core = {
    pkgs,
    lib,
    ...
  }: let
    modules = with self.nixosModules; [
      user
      bootloader
      nix
      overlays
      hardware
      locale
      nix-ld
    ];
  in {
    # Hardware/disk config is deliberately NOT imported here. It is per-host and
    # lives in modules/hosts/<host>/{_hardware.nix,disks.nix}, wired up by that
    # host's default.nix. Importing it from this shared module used to mean both
    # hosts resolved to whichever machine's /etc/nixos file existed at build time.
    imports = modules;
    services = {
      openssh.enable = true;
      avahi.enable = true;
    };
    environment.systemPackages = with pkgs; [
      # neovim is provided by the nvim feature module (programs.neovim.enable).
      unzip
      p7zip-rar
      usbutils
      lsof
      gvfs
      libnotify
      python313
      curlWithGnuTls
      wget
    ];
    system.stateVersion = "26.05";
  };
}