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/SkillLastTargetTribeFilter.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using System.Linq;
+using Wizard.Battle;
+
+public class SkillLastTargetTribeFilter : ISkillCardFilter
+{
+	private readonly bool _isEqual;
+
+	public SkillLastTargetTribeFilter(string op)
+	{
+		_isEqual = op == "=";
+	}
+
+	public IEnumerable<IReadOnlyBattleCardInfo> Filtering(IEnumerable<IReadOnlyBattleCardInfo> cards, SkillOptionValue option)
+	{
+		for (int i = 0; i < cards.Count(); i++)
+		{
+			if (!(cards.ElementAt(i) is BattleCardBase card))
+			{
+				continue;
+			}
+			List<BattleCardBase> lastTarget = card.SelfBattlePlayer.LastTargetCardsList.FirstOrDefault();
+			for (int j = 0; j < lastTarget.Count; j++)
+			{
+				if (card.Tribe.FindAll(lastTarget[j].Tribe.Contains).Count > 0 == _isEqual)
+				{
+					yield return card;
+				}
+			}
+		}
+	}
+}