Fascinating. I was thinking how the factory should be communicated to the model, and represented "internally". Images aren't the right solution (very high bandwidth for no real benefit). An ASCII grid of the game's tiles (more likely, a small chunk of it) is orders of magnitude better, but you still don't need to simulate every tile in a conveyor. It's just a line, right? So the whole thing is actually a graph!

That compresses nicely into text, I imagine.

I'd like to hear more details about your symbolic approach!