nix-conventionslisted

# Nix Conventions Module layout rules for machine definitions. - **Platform guards.** `lib.optionals pkgs.stdenv.isLinux` for package lists. `lib.mkIf pkgs.stdenv.isLinux` for file and service blocks. - **Scripts live in the store.** `writeShellApplication` plus `readFile`, never a checkout path inside a systemd unit. A unit pointing into a checkout breaks the moment the checkout moves or the machine bootstraps fresh. - **Home paths are bound once.** `config.home.homeDirectory` through one named binding, never a literal.