refactor(js/core): restrict automatic shutdown signal handlers to development environment only

js/genkit/src/genkit.ts

@@ -782,14 +782,19 @@ export function genkit(options: GenkitOptions): Genkit {
   return new Genkit(options);
 }
 
-const shutdown = async () => {
-  logger.debug('Shutting down all Genkit servers...');
-  await ReflectionServer.stopAll();
-  process.exit(0);
-};
-
-process.on('SIGTERM', shutdown);
-process.on('SIGINT', shutdown);
+// In development, we want to ensure that pressing Ctrl+C shuts down all reflection servers
+// and exits immediately. In production, we do not register signal handlers to avoid
+// overriding default Node.js behavior and breaking the host application's graceful shutdown.
+if (isDevEnv()) {
+  const shutdown = async () => {
+    logger.debug('Shutting down all Genkit servers...');
+    await ReflectionServer.stopAll();
+    process.exit(0);
+  };
+
+  process.on('SIGTERM', shutdown);
+  process.on('SIGINT', shutdown);
+}
 
 let disableReflectionApi = false;