Remove debug logging and add JSON scalar documentation

- Remove console.log debug statement from TCK test
- Add GraphQL documentation comment to JSON scalar type
- Explain JSON scalar supports objects, arrays, and primitives

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/protocols/graphql/src/index.ts

@@ -664,6 +664,10 @@ export class GraphQLPlugin implements RuntimePlugin {
 
         let typeDefs = `#graphql
   # Custom scalars
+  """
+  Represents arbitrary JSON values. Can be used for dynamic data structures.
+  Supports objects, arrays, strings, numbers, booleans, and null.
+  """
   scalar JSON
   
   # Common filter types

packages/protocols/graphql/src/tck.test.ts

@@ -74,7 +74,6 @@ class GraphQLEndpoint implements ProtocolEndpoint {
     const result = await this.graphqlRequest(mutation, { input: operation.data });
 
     if (result.errors) {
-      console.log('GraphQL create error:', JSON.stringify(result.errors, null, 2));
       return {
         success: false,
         error: {