This is very interesting topic.. I have also take a look on the code, and its look as ... interestingly complex system
I have heard an opinion (interview with Shogun 2 TW programmer) that AI programming is one of the most complicated and challenging software areas..
Do you have something similar to Class Diagram of the code? The graph showing how the Classes and their objects are connected and related to each other, which methods they have etc.. this would ease the process of familiarising with the code?
Best Regards,