State-Transition Dynamic Surface Effects

Own viewport-locked appearance history and its composite. Route world/object residue to $threejs-particles-trails-and-effects, weather accumulation to $threejs-rain-snow-and-wet-surfaces, bounded water to $threejs-water-optics, and shared full-frame output decisions to $threejs-image-pipeline.

When temperature, phase, loading, wetness, contact, or weather drives the appearance, close this local handoff before step 1: