“Today’s judgments are yet another strong confirmation from
ECJ that national security, law enforcement and intelligence services are not above the EU rule of law”
You should take a look at libreoffice collaborative feature, with the basic "track changes"[0] settings.
You can even work with multiple users as the same times (for example when opening files via webdav with nextcloud, or any other way to share your data) !
Edit: There's some recommendations on versionning odt files by using .fodt extension [1].
Your project seems nice! I'll give it a try ;-) Only thing, the Jupiter-like part is not clear enough.
0: https://www.nurtch.com/
1: https://docs.nurtch.com/en/latest/rubix-library/index.html
2: https://docs.gitlab.com/ee/user/project/clusters/runbooks/