Fix bundler error when running --status from demo directory

The issue was that swap-deps was requiring bundler/setup unconditionally,
which would fail when running from a demo directory with a Gemfile that
had GitHub gems not yet checked out.

Solution: Only require bundler/setup for commands that actually need gem
dependencies (swap, restore, apply). Read-only commands (status, cache,
list-watch, kill-watch, clean-cache) only use git/filesystem operations
and don't need bundler.

This fixes the error:
  'The git source https://github.com/... is not yet checked out.
   Please run `bundle install`...'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

lib/demo_scripts/swap_deps_cli.rb

@@ -39,8 +39,9 @@ def run!
       detect_context!
       parse_options!
 
-      # Require bundler/setup only when actually running commands (not for --help)
-      require 'bundler/setup'
+      # Only require bundler/setup for commands that actually need gem dependencies
+      # Status, cache, and watch commands only use git/filesystem, not gems
+      require 'bundler/setup' unless read_only_command?
 
       if @show_status
         show_status_info
@@ -83,6 +84,11 @@ def run!
 
     private
 
+    # Check if the command is read-only (doesn't need bundler/setup)
+    def read_only_command?
+      @show_status || @show_cache || @list_watch || @kill_watch || @clean_cache || @clean_cache_gem
+    end
+
     # rubocop:disable Lint/DuplicateBranch
     def process_gem_value(gem_name, value)
       # Check if it's a local filesystem path first (before checking for GitHub specs)