Pretty good work thank you. 🚀

I have some minor remarks which should improve mainly the maintenance aspect of the code.

After those changes it should be ready to go.

Please amend your changes to avoid creating new commits.

Please confirm that you are fine to release the code either under MIT or LGPL license in the body of your PR text.

Thanks for your work 👍

I need to check it on the PC one more if the solution file is working like intended (I did the review on mobile).

I checked the solution in Rider. I think it is not necessary to change the GirCore.sln file. The new attribute is part of the Test projects through the Directory.Build.props file already. This would match how it is done in the "Generation" folder where a "Shared" folder exists in the file system, too.