cull(engine-cleanup): pass-8 phase-2 cascade round 1

[trim] fully-unreachable files deleted: 6
[trim] files edited: 55, files deleted: 0, nodes removed: 244
[type-trim] files edited: 1, types removed: 1

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.BattleEngine/Engine/PanelMgr.cs

@@ -8,10 +8,8 @@ public class PanelMgr : MonoBehaviour
 {
 	public enum BattleAlertType
 	{
-		EmoteLimit,
 		SelectChoiceCard,
 		DisconnectInfomation,
-		DisconnectInfomationMulligan,
 		None
 	}