I cannot agree enough. Items 1 and 5 especially are worth reiterating: How to run/test/build things should be entirely documented in terms of code, not README f

I cannot agree enough. Items 1 and 5 especially are worth reiterating: How to run/test/build things should be entirely documented in terms of code, not README files, unless there is no other way. README instructions become outdated quickly and are hard to test in a reproducible manner. IMO, every project should have one single CLI presenting the developer with everything she or he can do (pull or update dependencies, build, run, test, …). Just like applications come with a UI for the user (whether the user is a real person or just some other application), every project should have a proper user interface for the developer.