select method
Implementation
@override
AiSelection select(List<AIModel> all, RotationSettings settings) {
final pool = _rotationPool(all);
if (pool.isEmpty) return AiSelection(_defaultOf(all), settings);
final index = settings.roundRobinIndex % pool.length;
final next = RotationSettings(
mode: settings.mode,
roundRobinIndex: (index + 1) % pool.length,
);
return AiSelection(pool[index], next);
}