Fix RuboCop offenses in bin/rails files

Add frozen string literal comments and proper spacing after magic
comments to comply with style guidelines.

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

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

Author: lizkenyon

bin/rails

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 # This file loads the test dummy Rails app for running gem tests
 APP_ROOT = File.expand_path("..", __dir__)
 APP_PATH = File.expand_path("test/dummy/config/application", APP_ROOT)

test/dummy/bin/rails

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 APP_PATH = File.expand_path("../config/application", __dir__)
 require_relative "../config/boot"
 require "rails/commands"