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/SkillLimitUpperCountFromNewestFilter.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Linq;
+
+public class SkillLimitUpperCountFromNewestFilter : ISkillSelectFilter
+{
+	private int _limitCount;
+
+	public SkillLimitUpperCountFromNewestFilter(int limitCount)
+	{
+		_limitCount = limitCount;
+	}
+
+	public int CalcCount(SkillOptionValue option)
+	{
+		return -1;
+	}
+
+	public IEnumerable<BattleCardBase> Filtering(IEnumerable<BattleCardBase> cards, SkillOptionValue option, SkillConditionCheckerOption checkerOption)
+	{
+		IEnumerable<BattleCardBase> enumerable = cards.Except(checkerOption.SkillDrewCards.Cast<BattleCardBase>());
+		if (enumerable.Count() < _limitCount)
+		{
+			return enumerable;
+		}
+		return enumerable.Skip(enumerable.Count() - _limitCount);
+	}
+}