Forward constructor options from ServerlessError to Error

Passing the options object through to the native Error constructor makes
ServerlessError support the standard { cause } option, so wrappers can
preserve the underlying error alongside a user-facing message.

Claude-Session: https://claude.ai/code/session_01XjKyVVZTqg7EmwqRgGtjwc

Author: mnapoli

lib/serverless-error.js

@@ -2,7 +2,7 @@
 
 class ServerlessError extends Error {
   constructor(message, code, options = {}) {
-    super(message);
+    super(message, options);
     this.code = code;
     this.decoratedMessage = options.decoratedMessage;
   }