Apply PR review feedback: frozen string literals and file handle fix

lib/generators/rolemodel/base_generator.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails/generators/base'
 require 'rails/generators/bundle_helper'
 require_relative 'replace_content_helper'

lib/rolemodel-rails.rb

@@ -1,7 +1,15 @@
+# frozen_string_literal: true
+
 module Rolemodel
   NODE_VERSION = '24.12.0'
   RUBY_VERSION = '4.0.1'
 end
 
 require 'rolemodel/version'
-require 'rolemodel/engine'
+
+begin
+  require 'rails/engine'
+rescue LoadError
+end
+
+require 'rolemodel/engine' if defined?(Rails::Engine)

spec/spec_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails'
 require 'bundler/setup'
 require 'generator_spec'

spec/support/helpers/example_app.rb

@@ -26,8 +26,7 @@ def cleanup_test_app
 
   def clean_test_gemfile
     gemfile_path = File.join(destination_root, 'Gemfile')
-    gemfile = File.open(gemfile_path)
 
-    File.write(gemfile_path, gemfile.grep_v(/rolemodel-rails/).join)
+    File.write(gemfile_path, File.readlines(gemfile_path).grep_v(/rolemodel-rails/).join)
   end
 end