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/SkillParameterDestroyedByFilter.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using System.Linq;
+using Wizard.Battle;
+
+public class SkillParameterDestroyedByFilter : ISkillCardFilter
+{
+	private string _player;
+
+	public SkillParameterDestroyedByFilter(SkillFilterCreator.ContentKeyword keyword)
+	{
+		switch (keyword)
+		{
+		case SkillFilterCreator.ContentKeyword.self_ability:
+			_player = "me";
+			break;
+		case SkillFilterCreator.ContentKeyword.both_ability:
+			_player = "both";
+			break;
+		default:
+			_player = string.Empty;
+			break;
+		}
+	}
+
+	public IEnumerable<IReadOnlyBattleCardInfo> Filtering(IEnumerable<IReadOnlyBattleCardInfo> cards, SkillOptionValue option)
+	{
+		List<IReadOnlyBattleCardInfo> list = new List<IReadOnlyBattleCardInfo>();
+		for (int i = 0; i < cards.Count(); i++)
+		{
+			IReadOnlyBattleCardInfo readOnlyBattleCardInfo = cards.ElementAt(i);
+			if (readOnlyBattleCardInfo.DestroyedBySkillList.Any((BattleCardBase.DestroyedBySkillInfo s) => s.Player == _player || _player == "both"))
+			{
+				list.Add(readOnlyBattleCardInfo);
+			}
+		}
+		return list;
+	}
+}