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/FramerateProfiler.cs

@@ -0,0 +1,51 @@
+using UnityEngine;
+
+internal class FramerateProfiler
+{
+	private float _lastTime;
+
+	private int _lastFrame;
+
+	private float _fps;
+
+	private bool _hasValue;
+
+	private const float MEASURE_RANGE = 5f;
+
+	public const int FPS_GOOD = 30;
+
+	public const int FPS_BAD = 20;
+
+	public float? Fps
+	{
+		get
+		{
+			if (_hasValue)
+			{
+				return _fps;
+			}
+			return null;
+		}
+	}
+
+	public void Init()
+	{
+		_lastTime = Time.realtimeSinceStartup;
+		_lastFrame = Time.frameCount;
+		_fps = 30f;
+	}
+
+	public void Update()
+	{
+		float realtimeSinceStartup = Time.realtimeSinceStartup;
+		float num = realtimeSinceStartup - _lastTime;
+		if (num >= 5f)
+		{
+			int num2 = Time.frameCount - _lastFrame;
+			_fps = (float)num2 / num;
+			_lastTime = realtimeSinceStartup;
+			_lastFrame = Time.frameCount;
+			_hasValue = true;
+		}
+	}
+}