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/Wizard/QuestSelectionPage.cs

@@ -12,9 +12,7 @@ public class QuestSelectionPage : UIBase
 {
 	public enum FirstSelectType
 	{
-		NONE,
-		PUZZLE,
-		BOSS_RUSH	}
+		NONE}
 
 	[SerializeField]
 	private UISpriteAtlasOverwriter _spriteAtlasOverwriter;