chore(agents): disable global skills

modules/agents/skills.nix

@@ -1,12 +1,18 @@
 {
   config,
   inputs,
+  pkgs,
   ...
 }:
+# Global agent skills, placed under the skills directory so they are active in
+# every project.
 let
   user = config.user.name;
+
+  # The skills installed globally, as derivations from the skills flake.
+  skills = with inputs.skills.packages.${pkgs.stdenv.hostPlatform.system}; [ ];
 in
 {
   home-manager.sharedModules = [ inputs.skills.homeModules.default ];
-  home-manager.users.${user}.programs.agents.skills = [ ];
+  home-manager.users.${user}.programs.agents.skills = skills;
 }