What does running git init inside ~/project/time-travel-pack establish?
git init
~/project/time-travel-pack
It turns only chrono_gadget.py into a repository.
chrono_gadget.py
It makes ~/project/time-travel-pack the repository's working tree root.
It initializes the parent ~/project directory as the working tree root.
~/project
It creates one global repository for every directory in the home folder.