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

[trim] fully-unreachable files deleted: 3
[trim] files edited: 21, files deleted: 0, nodes removed: 38
[type-trim] files edited: 3, types removed: 3

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

SVSim.BattleEngine/Engine/iTween.cs

@@ -476,14 +476,6 @@ public class iTween : MonoBehaviour
 		Launch(target, args);
 	}
 
-	public static void ShakePosition(GameObject target, Hashtable args)
-	{
-		args = CleanArgs(args);
-		args["type"] = "shake";
-		args["method"] = "position";
-		Launch(target, args);
-	}
-
 	private void GenerateTargets()
 	{
 		string text = type;