add comments to everything potentially consumer facing

sdk/base/lib/util/asError.ts

@@ -1,3 +1,11 @@
+/**
+ * Converts an unknown thrown value into an Error instance.
+ * If `e` is already an Error, wraps it; if a string, uses it as the message;
+ * otherwise JSON-serializes it as the error message.
+ *
+ * @param e - The unknown value to convert
+ * @returns An Error instance
+ */
 export const asError = (e: unknown) => {
   if (e instanceof Error) {
     return new Error(e as any)