docs(nix): require natu checks

configs/nixos/modules/shell/nvim/default.nix

@@ -32,6 +32,7 @@ in
           ripgrep # backs the picker's live grep
           fd # backs the picker's file finder
           wl-clipboard # provides a non-blocking clipboard provider on Wayland
+          nixd # provides Nix language-server support
         ];
 
         globals.mapleader = " ";
@@ -189,6 +190,8 @@ in
               installRustc = false;
               installRustfmt = false;
             };
+
+            servers.nixd.enable = true;
           };
 
           gitsigns = {

src/skills/style/nix/SKILL.md

@@ -12,7 +12,10 @@ After editing Nix files, run:
 
 ```bash
 nix run .#fix
+bazel run //src/natu:natu -- <modified-nix-paths>
 ```
 
-Finish when `nix run .#fix` succeeds and the Nix change follows the loaded rules.
-If the command fails, report the failure.
+Pass every modified Nix path to Natu.
+
+Finish when both commands succeed and the Nix change follows the loaded rules.
+If a command fails, report the failure.