@modoki/engine / index / ZoneOccupant
Variable: ZoneOccupant
constZoneOccupant:TagTrait
ZoneOccupant — a marker (tag) trait: "this entity participates in zone triggers." Only entities carrying it are tested for containment by the Zone2D/Zone3D trigger systems, so a scene with a few actors (the player, an enemy) doesn't pay to test every positioned prop each frame — the author opts an entity in explicitly.
Dimension-agnostic: the SAME marker opts an entity into BOTH 2D and 3D zone tests. A given entity is normally one or the other (its Transform lives in a 2D or 3D scene), so a 3D zone only ever contains 3D occupants in practice. Pure tag — no fields; membership IS the signal. Pair with a Transform (the occupant's world position is what's tested).