Added clean shutdown + tests

src/server/stdio.ts

@@ -62,8 +62,16 @@ export class StdioServerTransport implements Transport {
   }
 
   async close(): Promise<void> {
+    // Remove all event listeners
     this._stdin.off("data", this._ondata);
     this._stdin.off("error", this._onerror);
+    this._stdout.removeAllListeners('drain');
+
+    // Destroy both streams
+    this._stdin.destroy();
+    this._stdout.destroy();
+
+    // Clear the buffer and notify closure
     this._readBuffer.clear();
     this.onclose?.();
   }