npc behavior

Linux-first guide to practical game AI: distills OpenAI Five, AlphaStar, AlphaZero, Gran Turismo Sophy, and Minecraft demo learning into reusable patterns (self-play ladders, imitation bootstrap, curricula, leagues, planning, multi-objective rewards, domain randomization), plus a minimal Bash/Python pipeline (Gymnasium+SB3+PyTorch) to train/evaluate PPO, with tips for determinism, scaling, and fair, reproducible agents.