A standard for build output might make sense to me. Maybe just throw cache stuff in .cache and build output to .build (with intermediate artifacts in there as well potentially).

When enabled via flag, dotnet puts stuff into artifacts/obj, artifacts/bin, and artifacts/publish respectively. I like that. So much better than every proj folder having their own.

And there's really no need to make it a dot folder. For the publish you don't want to anyway. And you may want to navigate to bin as well, to run a build or inspect the output.