Tools like git-filter-repo[1] support rewriting commit hashes in commit messages. git-filter-repo actually does it by default; see `--preserve-commit-hashes` in the manual[2].
[1]: https://github.com/newren/git-filter-repo
[2]: https://htmlpreview.github.io/?https://github.com/newren/git...
I need git-filter-repo to rewrite entire documentation and also resurrect and rehire earlier employees to repeat their GPG signatures.
Sure, but that's not going to rewrite Slack messages, emails, GitHub links, docs