Document use of klarohq.klaro-js via composer.libraries.json in README.md

Or should we use https://www.drupal.org/project/klaro_js → in the future in general?

That library from #2 is being installed automatically by this module and it is a mirror of the upstream library just to simplify installation. In fact, regular users don't need to do anything other than installing this module, and they're all set. This also works for recipes and within Project Browser.

The option to install your own library as shown in the extra composer file is only required if you want to override the OOTB library with your own.

We have tightened up the README a little and added a link to the documentation: https://www.drupal.org/node/3487559 →

Perhaps you can suggest a better wording so that this is not overlooked?

See line 72.

Thanks, so my confusion was, that I tested the module at simplytest.me first and there the library was not downloaded automatically. Strange.

as of #3 and #4

I think we can close this. Was a misunderstanding on my side, sorry.