Follow verb on interaction dispatcher. FollowTarget component tracks
target entity, proximity ticks, and LOS-lost ticks. update_follow_state
system: observation events fire at double frequency while following,
NPC suspicion increases via stress when player within 2 tiles for 60+
ticks (configurable). Follow ends on LOS lost timeout, suspicion
threshold crossed, or player issues different action. FollowStateWire
emitted in ObserverSnapshot for client HUD.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>