Looks cool! Including the script in the project directory is the way, and I created on makesh[1] with that in mind. Since it's a submodule it can be easily pulled around with a repo and updated.

Glad to see people are finally going back to ahell scripts since they are very ergonomic and with a little portability in mind, they can be cross platform too.

[1] https://github.com/Baldomo/makesh