feat(rex): make Rex Beta the default terminal

modules/home/shell/tmux.nix

@@ -30,6 +30,7 @@
       set-option -g focus-events on
       # Avoid CSI-u newline remapping that breaks Neovim pastes
       set -as terminal-features 'xterm-kitty:clipboard,RGB'
+      set -as terminal-features 'xterm-rex:clipboard,RGB'
       set -g status-interval 5
         setw -g automatic-rename on
         set -g renumber-windows on

modules/home/shell/zsh.nix

@@ -53,6 +53,12 @@
         "$HOME/.lmstudio/bin"
       )
 
+      # Rex prepends its own bin dir to PATH, but the fixed list above drops it.
+      # Keep it first so the CLI matches the running server. Empty outside Rex.
+      if [ -n "$REX_BIN_DIR" ]; then
+        path=("$REX_BIN_DIR" $path)
+      fi
+
       export PATH
 
       # kitten ssh refuses to run outside a kitty window.