Well it does make AI cleverer by equipping better artifacts

If you ask for the general improvement of AI decisionmaking, like map movement, advanced use of spells, combat tactics, chaining then no, there will never be such a mod. Problems can only be tackled separately. So if there is a very specific aspect in your game you want to improve, describe it as good as possible and write down your solution to that problem and then maybe, only maybe someone will sit down and try it.