I have seen since 1.0 that the AI is getting dumber and dumber.
No, the AI got a little bit better. Not much, though. But it surely didn't get worse. (Though the nerf in siege frigates made it's early rushes much less threatening, but that was a balance change, not an AI change.)
I would really like to know where the AI files are,
Inside the .exe, I would say.
Ie. the AI is hardcoded and can't be changed.