Converted entity materials to new fade shader
Implemented visibility system
Refactored per-instance entity code to run inside monobehavior on entity instances
Created state machine AI for enemy ships with basic patrol and combat routines
Removed legacy AI code (controller item behaviors)
Added automatic trigger group assignment for matched weapons
Created ship collision system
Created shield VFX and colliders
New asteroid models
Asteroid belts have a custom width curve = tighter belts
Zone Generator uses color theory now
Zone gravity well is much deeper, filled with ambient glow
Gravity waves flow over time
Fog follows gravity waves
Gas Giant shader fixed, offsets distort albedo properly
Fog sample distances follow exponential curve
Fog noise offsets sampling position instead of subtracting density = more natural looking noise
Fog brightness fades out at max view distance
