chore: add note explaining module choice to CommonJS export

Author: jdbruijn

src/index.ts

@@ -3,9 +3,9 @@ import {plugin} from './plugin.js';
 /**
  * Export single object, according to the CommonJS model. The CommonJS module is
  * explicitly used here as that's the kind of module commitlint requires for
- * plugins.
+ * shareable configurations. This project is an ES module for ease of
+ * development, and thus requires the error for an export assignment to be
+ * disabled.
  */
-// @ts-expect-error TS1203 Export assignment cannot be used when targeting
-// ECMAScript modules. Consider using 'export default' or another module format
-// instead.
+// @ts-expect-error TS1203
 export = plugin;