Class CollisionEventTracker

Per-pair collision event tracking with enter/stay/exit lifecycle. Wraps the CombatManager or manual collision checks with stateful tracking.

Usage:

const events = new CollisionEventTracker();
events.onCollision((event, phase) => {
  if (phase === 'enter') applyDamage(event);
});
// Each frame, report active collision pairs:
events.beginFrame();
events.reportCollision(entityA, entityB);
events.endFrame(); // fires enter/stay/exit callbacks
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