the open-rpc document should be paste-able into playground

At the moment, the document is using local refs to a schema that doesnt exist until you bundle it. This ticket is to make the document more easy to work on by only using remote refs when the underlying ref is from execution-apis document.

Locate the OpenRPC document and inspect its local schema references, especially those originating from the execution-apis document. Confirm that the document can be pasted into the playground without bundling, while remote references are used only for the specified execution-apis references.

Written by the indexing model from the issue text.