fix: force UTF-8 encoding for non-UTF8 locales

The CLI now explicitly sets UTF-8 encoding for external and internal
strings to prevent encoding errors when run in environments with
C/POSIX locales (e.g., Homebrew test sandboxes).

Bump version to 2.3.1

Author: cardmagic

exe/classifier

@@ -1,4 +1,10 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Force UTF-8 encoding for proper handling of model data and user input
+Encoding.default_external = Encoding::UTF_8
+Encoding.default_internal = Encoding::UTF_8
+
 require 'classifier/cli'
 
 result = Classifier::CLI.new(ARGV).run

lib/classifier/version.rb

@@ -1,3 +1,3 @@
 module Classifier
-  VERSION = '2.3.0'.freeze
+  VERSION = '2.3.1'.freeze
 end