Remove unused MCP::Annotations

Author: sambostock

lib/mcp.rb

@@ -32,13 +32,4 @@ def configuration
       @configuration ||= Configuration.new
     end
   end
-
-  class Annotations
-    attr_reader :audience, :priority
-
-    def initialize(audience: nil, priority: nil)
-      @audience = audience
-      @priority = priority
-    end
-  end
 end