feat(rex): make Rex Beta the default terminal

modules/darwin/home/programs/aerospace/modes.nix

@@ -19,7 +19,8 @@
     "alt-comma" = "layout accordion horizontal vertical";
     "alt-space" = "layout floating tiling";
 
-    "alt-enter" = ''exec-and-forget open -na "kitty"'';
+    # Rex is a single app, so open focuses it. Cmd+N in Rex opens a new window.
+    "alt-enter" = ''exec-and-forget open -a "Rex Beta"'';
     "alt-backspace" = "close";
 
     "alt-tab" = "workspace-back-and-forth";
@@ -33,7 +34,7 @@
   // workspaceSendBindings;
 
   float.binding = {
-    enter = ''exec-and-forget open -na "kitty" && aerospace layout floating'';
+    enter = ''exec-and-forget open -a "Rex Beta" && aerospace layout floating'';
     i = [
       ''exec-and-forget open -na "iTerm.app"''
       "layout floating"

modules/darwin/home/programs/aerospace/user-settings.nix

@@ -32,7 +32,12 @@
       "if".window-title-regex-substring = "pet|hatch";
       run = "layout floating";
     }
-    # Exception: Kitty on workspace 5 floats
+    # Exception: Rex and Kitty on workspace 5 float
+    {
+      "if".app-id = "com.superlogical.rex";
+      "if".workspace = "5";
+      run = "layout floating";
+    }
     {
       "if".app-id = "net.kovidgoyal.kitty";
       "if".workspace = "5";

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.