Add a2a-server package to gemini-cli (#6597)

packages/a2a-server/src/server.ts

@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as url from 'node:url';
+import * as path from 'node:path';
+
+import { logger } from './logger.js';
+import { main } from './agent.js';
+
+// Check if the module is the main script being run. path.resolve() creates a
+// canonical, absolute path, which avoids cross-platform issues.
+const isMainModule =
+  path.resolve(process.argv[1]) ===
+  path.resolve(url.fileURLToPath(import.meta.url));
+
+process.on('uncaughtException', (error) => {
+  logger.error('Unhandled exception:', error);
+  process.exit(1);
+});
+
+if (
+  import.meta.url.startsWith('file:') &&
+  isMainModule &&
+  process.env['NODE_ENV'] !== 'test'
+) {
+  main().catch((error) => {
+    logger.error('[CoreAgent] Unhandled error in main:', error);
+    process.exit(1);
+  });
+}