A clever bot that validates pull requests on the Bootstrap project: https://github.com/twbs/rorschach/blob/master/README.md
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I'm increasingly doubtful that commit messages should be entirely immutable.
I sometimes find myself editing or commenting on merged pull requests, to help future readers.
Phabricator appended a URL to commit messages, which helped. In principle PR merging could do the same thing.
Blogging about my programming language project: choosing the basic syntax!
https://www.garden-lang.org/blog/syntax.html
I've dabbled with 'conventional commits' for a personal project but I found they slowed me down.
It's not always easy to categorise a commit as a fix, a chore etc. Sometimes refactorings also fix bugs.
Do you use them? I can imagine a large, mature project benefitting more.