Consider adding (a copy of) the boilerplate or sample app into the libs package for testing

[patroza]

Right now we use lib linking into boilerplate or production projects.
This however is fragile and puts some distance between the code and example implementations.
Perhaps it would be a good idea to embed a copy of the boilerplate (or the sample project) as an example, which also runs part of the build as testing.

But perhaps it's instead more important we improve test coverage and have some smaller examples instead.