chore: close stdin before sending sigkill

Author: johnnyasantoss

src/client/stdio.ts

@@ -225,6 +225,12 @@ export class StdioClientTransport implements Transport {
             await Promise.race([closePromise, new Promise(resolve => setTimeout(resolve, 1_000).unref())]);
 
             if (processToClose.exitCode === null) {
+                try {
+                    processToClose.stdin?.end();
+                } catch {
+                    // ignore errors in trying to close stdin
+                }
+
                 try {
                     processToClose.kill('SIGKILL');
                 } catch {