Add apache2 SPDX headers to all source files (#48)

packages/cli/src/utils/schemaValidator.ts

@@ -1,3 +1,9 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /**
  * Simple utility to validate objects against JSON Schemas
  * In a real implementation, you would use a library like Ajv