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/EnemyAINull.cs

@@ -0,0 +1,83 @@
+using System.Collections.Generic;
+using Wizard.Battle.View.Vfx;
+
+namespace Wizard;
+
+public class EnemyAINull : IEnemyAI
+{
+	public bool IsStackAction => false;
+
+	public bool IsConnectNetwork => false;
+
+	public bool IsAIExecution => false;
+
+	public void ExecuteEnemyAI(bool useWait)
+	{
+	}
+
+	public void StopEnemyAI()
+	{
+	}
+
+	public void InitOnGame(BattlePlayerBase selfBattlePlayer, BattlePlayerBase opponentBattlePlayer)
+	{
+	}
+
+	public void Mulligan(List<BattleCardBase> dstList, BattlePlayerBase selfBattlePlayer, BattlePlayerBase opponentBattlePlayer)
+	{
+	}
+
+	public void SelectSkillTarget(AIVirtualCard actCard, AIOperationType operationType, AISinglePlayptnRecord playptnRecord)
+	{
+	}
+
+	public float CalcFieldAdvantage()
+	{
+		return 0f;
+	}
+
+	public float Atk_EvaluateBattleCardOnErase(BattleCardBase card, List<int> playPtn, bool useStyle)
+	{
+		return 0f;
+	}
+
+	public float Atk_EvaluateBattleCardOnReturn(BattleCardBase card, List<int> playPtn, int restPp, bool useStyle)
+	{
+		return 0f;
+	}
+
+	public IAIEmoteCtrl EmoteCtrl()
+	{
+		return new AIEmoteCtrlNull();
+	}
+
+	public void TurnEnd()
+	{
+	}
+
+	public void Retire()
+	{
+	}
+
+	public void Disconnect()
+	{
+	}
+
+	public void Reconnect()
+	{
+	}
+
+	public void CleanupStackedAction()
+	{
+	}
+
+	public bool SetUpBattleState(int classId, AI_LOGIC_LV logicLv, string deckName, string styleName, string emoteName, int enemyAiID = -1)
+	{
+		return true;
+	}
+
+	public VfxBase GetEmote(AIEmoteCmdType cmdType, AISituationInfo situation = null, ClassCharaPrm.EmotionType receivedEmoteType = ClassCharaPrm.EmotionType.NULL, int emoteInput = -1)
+	{
+		return NullVfx.GetInstance();
+	}
+}