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/roles/tmux/default.nix

@@ -0,0 +1,62 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.home.roles.tmux;
+
+  tokyo-night = pkgs.tmuxPlugins.mkTmuxPlugin {
+    pluginName = "tokyo-night";
+    rtpFilePath = "tokyo-night.tmux";
+    version = "1.6.1";
+    src = pkgs.fetchFromGitHub {
+      owner = "janoamaral";
+      repo = "tokyo-night-tmux";
+      rev = "d610ced20d5f602a7995854931440e4a1e0ab780";
+      sha256 = "sha256-17vEgkL7C51p/l5gpT9dkOy0bY9n8l0/LV51mR1k+V8=";
+    };
+  };
+in
+{
+  options.home.roles.tmux = {
+    enable = mkEnableOption "tmux terminal multiplexer with Tokyo Night theme";
+  };
+
+  config = mkIf cfg.enable {
+    programs.tmux.enable = true;
+    programs.tmux.terminal = "tmux-direct";
+    programs.tmux.keyMode = "vi";
+    programs.tmux.escapeTime = 0;
+    programs.tmux.mouse = true;
+    programs.tmux.newSession = true;
+    programs.tmux.historyLimit = 50000;
+    programs.tmux.clock24 = true;
+    programs.tmux.baseIndex = 1;
+    programs.tmux.prefix = "M-\\\\";
+
+    programs.tmux.plugins = with pkgs; [
+      tmuxPlugins.cpu
+      tmuxPlugins.battery
+      tmuxPlugins.better-mouse-mode
+      tmuxPlugins.net-speed
+      tmuxPlugins.online-status
+      tmuxPlugins.pain-control
+      tmuxPlugins.tilish
+      tmuxPlugins.yank
+
+      {
+        plugin = tmuxPlugins.resurrect;
+        extraConfig = "set -g @resurrect-strategy-nvim 'session'";
+      }
+      {
+        plugin = tmuxPlugins.continuum;
+        extraConfig = ''
+          set -g @continuum-restore 'on'
+          set -g @continuum-save-interval '15' # minutes
+        '';
+      }
+
+      tokyo-night
+    ];
+  };
+}