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.

README.md

@@ -182,12 +182,18 @@ home-manager switch --flake .#me              # desktop: every theme change, no
 Day-to-day you'll use the shipped shortcuts instead:
 
 ```sh
-nomarchy-pull      # git pull (if checkout) + nix flake update  — no rebuild
+nomarchy-pull      # nix flake update — refresh inputs (nomarchy, nixpkgs, …);
+                   # optional git pull only if ~/.nomarchy tracks a remote
 nomarchy-rebuild   # system rebuild against the CURRENT lock (sudo inside;
                    # BTRFS snapshot first when snapper is on; nvd diff after)
 nomarchy-home      # home-manager switch — desktop only, no sudo, no lock bump
 ```
 
+`~/.nomarchy` is **your machine flake** (`system.nix` / `home.nix`). Newer
+Nomarchy code arrives when `flake.lock` updates the `nomarchy` input
+(`nomarchy-pull`), not by `git pull` of that directory (many installs have
+no remote there — only local commits from auto-commit).
+
 | When | Run |
 |---|---|
 | Pull newer Nomarchy / nixpkgs / inputs | `nomarchy-pull` |

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