Internal Release 0.4.0

- Added support for handle_json method from JSON RPC gem to allow consumers to pass JSON strings
- Added context parameter to prompt templating system

- Updated tool and prompt registration to use class references instead of instances
- Changed tool response is_error to isError to match protocol specification

lib/model_context_protocol/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module ModelContextProtocol
-  VERSION = "0.3.0"
+  VERSION = "0.4.0"
 end