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/OrderedDictionaryEnumerator.cs

@@ -0,0 +1,39 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace LitJson;
+
+internal class OrderedDictionaryEnumerator : IDictionaryEnumerator, IEnumerator
+{
+	private IEnumerator<KeyValuePair<string, JsonData>> list_enumerator;
+
+	public object Current => Entry;
+
+	public DictionaryEntry Entry
+	{
+		get
+		{
+			KeyValuePair<string, JsonData> current = list_enumerator.Current;
+			return new DictionaryEntry(current.Key, current.Value);
+		}
+	}
+
+	public object Key => list_enumerator.Current.Key;
+
+	public object Value => list_enumerator.Current.Value;
+
+	public OrderedDictionaryEnumerator(IEnumerator<KeyValuePair<string, JsonData>> enumerator)
+	{
+		list_enumerator = enumerator;
+	}
+
+	public bool MoveNext()
+	{
+		return list_enumerator.MoveNext();
+	}
+
+	public void Reset()
+	{
+		list_enumerator.Reset();
+	}
+}