retrieveFile method
List files in the workspace
API Reference: https://docs.anthropic.com/en/api/files-metadata
Returns metadata for a specific file including size, type, and creation date.
Implementation
@override
Future<FileObject> retrieveFile(String fileId) async {
final responseData = await client.getJson('files/$fileId');
return FileObject.fromAnthropic(responseData);
}