AlifePlus: Reactive Architecture on STALKER's A-Life

AlifePlus is a mod for STALKER Anomaly that implements a layered reactive event pipeline using pub/sub architecture on top of the X-Ray engine's A-Life system, which simulates ~2000 NPCs across 30 maps. Instead of costly scan loops, it piggybacks on existing A-Life transitions with O(1) per-event evaluation, uses Bresenham-derived rate limiting for admission control, and employs a priority-based chain dispatch system with detailed outcome propagation codes for full observability.