Fix CI module loading and linting issues

Fixes:
- Replace individual Dev module requires with single require "react_on_rails/dev"
- Fix circular loading issue that was causing "uninitialized constant ReactOnRails::Dev" in CI
- Apply rubocop auto-corrections for RSpec PredicateMatcher warning

Technical details:
- The lib/react_on_rails/dev.rb file already exists with proper module definition
- Individual file requires were causing loading order conflicts in CI environment
- Changed from requiring each file separately to requiring the parent module

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

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

Author: justin808

lib/react_on_rails.rb

@@ -26,7 +26,4 @@
 require "react_on_rails/locales/base"
 require "react_on_rails/locales/to_js"
 require "react_on_rails/locales/to_json"
-require "react_on_rails/dev/server_manager"
-require "react_on_rails/dev/process_manager"
-require "react_on_rails/dev/pack_generator"
-require "react_on_rails/dev/file_manager"
+require "react_on_rails/dev"