What do you recommend for programming the stuff that corresponds to this sort of state? For a similar problem of making the AI code for a bullet hell shmup, I

What do you recommend for programming the stuff that corresponds to this sort of state? For a similar problem of making the AI code for a bullet hell shmup, I thought it was very important to be able to edit the AI code easily to try out a lot of stuff. I've had decent experiences using BulletML and Lua for this, but both of them provide no path forward if I want to update the game and load an old save. Like, because I was not asked to explicitly name every single state in my "AI program", I cannot create a mapping between the possible old states and the possible new states to use when running the updated software against an old save. Then again, the fact that I was not asked to explicitly name every single state in my program feels like a pretty central component of the short iteration time I was after to begin with. For shmup AI this maybe ends up being acceptable because the game doesn't need to run new behaviors against old save files. But if I did need that, maybe I should be using two systems, one for experimentation and another one for making something upgradable?