refactor: re-export JSONRPCMessageSchema from generated schemas

Remove manual definition and import from sdk.schemas.ts instead.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: ochafik

src/types.ts

@@ -99,6 +99,7 @@ import {
     JSONRPCNotificationSchema,
     JSONRPCResultResponseSchema,
     JSONRPCErrorResponseSchema,
+    JSONRPCMessageSchema,
     // Resource request schemas
     ListResourcesRequestSchema,
     ListResourceTemplatesRequestSchema,
@@ -277,6 +278,7 @@ export {
     JSONRPCNotificationSchema,
     JSONRPCResultResponseSchema,
     JSONRPCErrorResponseSchema,
+    JSONRPCMessageSchema,
     ListResourcesRequestSchema,
     ListResourceTemplatesRequestSchema,
     SubscribeRequestSchema,
@@ -450,13 +452,6 @@ export enum ErrorCode {
 
 export const JSONRPCResponseSchema = z.union([JSONRPCResultResponseSchema, JSONRPCErrorResponseSchema]);
 
-export const JSONRPCMessageSchema = z.union([
-    JSONRPCRequestSchema,
-    JSONRPCNotificationSchema,
-    JSONRPCResultResponseSchema,
-    JSONRPCErrorResponseSchema
-]);
-
 /* Cancellation */
 /**
  * This notification can be sent by either side to indicate that it is cancelling a previously-issued request.