rb/thrift: merge processor comments

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: tgallice

lib/rb/lib/thrift/processor.rb

@@ -91,8 +91,7 @@ def initialize(handler, middlewares = [], logger=nil)
         @logger = logger
       end
       @middleware = Middleware.wrap(middlewares)
-
-      # Walk ancestors so services extending another one expose inherited methods.
+      # Walk ancestors child first so inherited methods are exposed and overrides win.
       # Child first: the closest definition wins and is built only once.
       @processors = self.class.ancestors.each_with_object({}) do |klass, acc|
         next unless klass.const_defined?(:METHODS, false)