feat(battle-engine): full Unity/VFX/god-object shims + expanded copy closure (2570 files)

Authored Unity primitive/object-model shim, VFX layer (control-flow-preserving, InstantVfx never invokes its action -- headless suppression), god-object stubs (GameMgr/EffectMgr/UIManager with faithfully-extracted nested enums), View/UI/Touch tree, LitJson+BetterList+Tuple copied, third-party stubs. Discovered Roslyn header-error masking: fixing class-header type errors unmasks body references, so the true copy closure is ~2570 files (was 782 under masking). Errors: masked-25720 -> 268; our shim files compile clean. Remaining: ~50 residual shim/external types, 24 NGUI UI-base overrides, static-type fixes, plus likely 1-2 more unmask waves.

SVSim.BattleEngine/Engine/Wizard/AIFusionMetamorphose.cs

@@ -0,0 +1,39 @@
+using System.Collections.Generic;
+
+namespace Wizard;
+
+public class AIFusionMetamorphose : AIScriptArgumentExpressions
+{
+	private int _targetId;
+
+	public AIFusionMetamorphose(string text)
+		: base(text)
+	{
+	}
+
+	protected override void InitExpressions(string text)
+	{
+		base.InitExpressions(text);
+		if (_exprList.Count <= 0 || _exprList.Count > 1)
+		{
+			_targetId = -1;
+			AIConsoleUtility.LogError($"AIFusionMetamorphose(): Arg count is out of range. Please check the value. count:{_exprList.Count}");
+		}
+		else
+		{
+			_targetId = _exprList[0].EvalID();
+		}
+	}
+
+	public override void Execute(AIVirtualCard tagOwner, AIVirtualField field, List<int> playPtn, AISituationInfo situation = null)
+	{
+		if (situation == null || situation.ActionType != AIOperationType.FUSION)
+		{
+			AIConsoleUtility.LogError("AIFusionMetamorphose.Execute(): Situation is not FUSION action type.");
+		}
+		else if (_targetId > 0)
+		{
+			AIMetamorphoseSimulationUtility.MetamorphoseHandOnVirtualField(situation.Actor, _targetId, tagOwner, field);
+		}
+	}
+}