fix(cli): nomarchy-pull skips git when no upstream

Machine flakes often have no remote (local auto-commits only). Distro
updates come from nix flake update of the nomarchy input. Only git pull
--ff-only when @{u} is set; always update the lock; print nomarchy rev.

modules/nixos/default.nix

@@ -54,7 +54,7 @@ in
 
         ${distroName} — a NixOS desktop, themed from one JSON.
 
-        nomarchy-pull                       git pull + flake input update (no rebuild)
+        nomarchy-pull                       update flake inputs (nomarchy, nixpkgs, …)
         nomarchy-rebuild                    rebuild the system (current lock)
         nomarchy-home                       rebuild the desktop / Home Manager
         nomarchy-theme-sync apply <theme>   switch the whole palette