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/LitJson/IJsonWrapper.cs

@@ -0,0 +1,48 @@
+using System.Collections;
+
+namespace LitJson;
+
+public interface IJsonWrapper : IList, ICollection, IEnumerable, IOrderedDictionary, IDictionary
+{
+	bool IsArray { get; }
+
+	bool IsBoolean { get; }
+
+	bool IsDouble { get; }
+
+	bool IsInt { get; }
+
+	bool IsLong { get; }
+
+	bool IsObject { get; }
+
+	bool IsString { get; }
+
+	bool GetBoolean();
+
+	double GetDouble();
+
+	int GetInt();
+
+	JsonType GetJsonType();
+
+	long GetLong();
+
+	string GetString();
+
+	void SetBoolean(bool val);
+
+	void SetDouble(double val);
+
+	void SetInt(int val);
+
+	void SetJsonType(JsonType type);
+
+	void SetLong(long val);
+
+	void SetString(string val);
+
+	string ToJson();
+
+	void ToJson(JsonWriter writer);
+}