Complete migration of home-manager modules to roles

Migrate all remaining home-manager modules from home/modules/ to home/roles/
to establish a unified role-based configuration pattern. This completes the
migration started in Phase 1.

Changes:
- Phase 1-3: Migrated tmux, plasma-manager, kubectl, and emacs to roles
- Phase 4: Migrated aerospace with custom options under home.roles.aerospace.*
- Phase 5: Migrated i3+sway with shared config and override options
- Phase 6: Removed empty home/modules/ directory

All home configs now import only ./roles with role-based enable options.
Updated flake.nix machine-specific overrides to use new namespaces.

Verified with nix flake check - all configurations build successfully.

home/home-darwin-work.nix

@@ -120,29 +120,25 @@
 
   home.shell.enableShellIntegration = true;
 
-  # Enable aerospace window manager with autoraise
-  programs.aerospace = {
-    enable = true;
-    leader = "cmd";
-    # Optional: Add per-machine userSettings overrides
-    # userSettings = {
-    #   mode.main.binding."${leader}-custom" = "custom-command";
-    # };
-  };
-
   home.roles = {
     base.enable = true;
     development = {
       enable = true;
       allowArbitraryClaudeCodeModelSelection = true;
     };
+    tmux.enable = true;
+    emacs.enable = true;
+    aerospace = {
+      enable = true;
+      leader = "cmd";
+      # Optional: Add per-machine userSettings overrides
+      # userSettings = {
+      #   mode.main.binding."${leader}-custom" = "custom-command";
+      # };
+    };
   };
 
   imports = [
     ./roles
-    ./modules/emacs
-    ./modules/kubectl
-    ./modules/tmux
-    ./modules/aerospace
   ];
 }