Version control for the context behind your team's work: why you decided something, what that requires, and how it gets done. Kept in your own git repository, and handed to each person's AI assistant as the slice their role needs. Nothing to install. Nobody has to learn a new tool.
From there it is a loop, not a setup wizard: your team pulls the current context and their tasks, sends work back, and you review it on your own cadence.
Signing in creates nothing on its own — you choose the project on the next screen.