Forcing developers to write comments[1] just to get code merged seems like the best possible way to ensure those comments are lies.

[1] Which, it's important to point out since you used the term "CI", are fundamentally untestable. There's absolutely no way to ensure a comment is correct. A CI smoke test at the very least verifies code builds and doesn't break pre-existing cases. No such validation is even theoretically possible for comments.

I’ve seen it done before and no, it was beautiful, everything was commented