Rather than just enforcing a consistent style for code, programmatically manage your commit messages format too! https://www.npmjs.com/package/commitizen
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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.
It's weird that GitHub shows time since the last commit, but not time since the first commit. It's a nice way of seeing how mature a project is.
Over a sufficiently long time horizon, all code you write is legacy code.