refactor: fix Style/OneClassPerFile by extracting top-level definitions into separate files (#18)

scripts/string_extensions.rb

@@ -0,0 +1,10 @@
+# typed: strict
+# frozen_string_literal: true
+
+# Simple polyfill for Homebrew extensions
+class String
+  def blank?
+    # Polyfill implementation to avoid external dependencies
+    nil? || empty? # rubocop:disable Homebrew/Blank, Lint/RedundantCopDisableDirective
+  end
+end