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/SkillCardFilterBase.cs

@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+using Wizard.Battle;
+
+public class SkillCardFilterBase : ISkillCardFilter
+{
+	protected readonly string _parameterText;
+
+	protected readonly string _parameterOptionText;
+
+	public SkillCardFilterBase(string parameterText, string op)
+	{
+		_parameterOptionText = op;
+		_parameterText = parameterText;
+	}
+
+	public virtual IEnumerable<IReadOnlyBattleCardInfo> Filtering(IEnumerable<IReadOnlyBattleCardInfo> cards, SkillOptionValue option)
+	{
+		return cards;
+	}
+
+	public virtual string GetParameterText()
+	{
+		return _parameterText;
+	}
+
+	public virtual string GetParameterOptionText()
+	{
+		return _parameterOptionText;
+	}
+}