Update error codes when process exiting the gemini cli (#13728)

packages/core/src/utils/exitCodes.ts

@@ -0,0 +1,13 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export const ExitCodes = {
+  SUCCESS: 0,
+  FATAL_AUTHENTICATION_ERROR: 41,
+  FATAL_INPUT_ERROR: 42,
+  FATAL_CONFIG_ERROR: 52,
+  FATAL_CANCELLATION_ERROR: 130,
+} as const;