Coverage for important strings

"Whitespace" and "Comment" yes a shell script can check. More complex but still trivial changes like "Renamed variable" or "Moved code into new subroutine" can be checked automatically but only with some knowledge of the language's syntax and semantics. At this point, rather than writing a parser for each language you might reach for an 80% solution by asking a LLM to work out roughly what's going on and whether there were any accidental code changes. If I had the option to get my commits and commit messages reviewed by AI, I'd certainly try it, although I am reluctant to have the AI write the code itself.