fix: address code review findings

internal/yandex/client.go

@@ -277,10 +277,10 @@ func isRetryableError(err error) bool {
 	if err == nil {
 		return false
 	}
-	// Check for HTTP status codes that are retryable (5xx errors)
+	// Check for HTTP status codes that are retryable (5xx errors and 429)
 	apiErr, ok := err.(*APIError)
 	if ok {
-		return apiErr.Code >= 500 && apiErr.Code < 600
+		return (apiErr.Code >= 500 && apiErr.Code < 600) || apiErr.Code == 429
 	}
 	// Check for network errors
 	errStr := err.Error()