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/BattleKeywordInfoListMgr.cs

@@ -53,9 +53,4 @@ public class BattleKeywordInfoListMgr : MonoBehaviour
 		}
 		return list;
 	}
-
-	public void SetPanelDepth(int depth)
-	{
-		_panel.depth = depth;
-	}
 }