engine cleanup passes 4-7 + multi-instancing ambient rip

Squashes 146 commits from battle-engine-extraction. Net: 2,045 files changed,
+11,896 / -158,687 lines. Ships engine passes 4-7 (dead-code cull, view-layer
stub, receive-path shrink) plus the Phase-5 AsyncLocal ambient deletion that
turns concurrent battles into a type-system property rather than a scope
contract.

## What landed

**Passes 4-7 (chunks 1-34):** Extended the Phase-4 const-false collapse into a
cascading cull across the skill graph, view layer, and receive-path periphery.
Six mode flags (IsWatchBattle/IsReplayBattle/IsAdmin/IsAdminWatch/IsPuzzleQuest/
IsAINetwork) became `const false`, every guarded block deleted. Field*.cs
subclass ctors + BackGroundBase + ObjectChecker culled to no-ops. Mulligan
family reworked to take a mgr param through IMulliganMgr.InitMulligan.
Emotion/Recovery/Resource clusters null-stubbed. Prediction/OperationSimulator/
skill filters converted from static ambient reads to per-mgr reads via
SkillPrm.ownerCard.SelfBattlePlayer.BattleMgr / ins.BattleMgr / this.BattleMgr.

**Phase-5 ambient rip (chunks 35-47):** Deleted BattleAmbient / BattleAmbient-
Context / TestBattleScope in full. Every per-battle mutable slot now lives on
the mgr instance itself:
  mgr.InstanceIsForecast / InstanceIsRandomDraw / InstanceRecoveryInfo /
  InstanceViewerId / InstanceNetworkAgent / GameMgr
BattleManagerBase.GetIns() returns null unconditionally; the residual static
flags + 3 façades (Certification.ViewerId, Data.BattleRecoveryInfo,
ToolboxGame.RealTimeNetworkAgent) are null-tolerant defaults kept for the
handful of engine-internal readers that still reference their types. Zero
BattleAmbient references anywhere in engine + node + tests.

Added pre-seeded GameMgr ctor overload threaded through the mgr chain
(BattleManagerBase → SingleBattleMgr / NetworkBattleManagerBase → NetworkStandard-
BattleMgr → HeadlessBattleMgr / HeadlessNetworkBattleMgr). Fixtures build a
GameMgr, seed it via HeadlessEngineEnv.SeedCharaIds/SeedNetUser, and pass it
to the mgr's ctor — no ambient reach.

Node side (SVSim.BattleNode/SessionBattleEngine): _ctx replaced with a plain
GameMgr field; 34 `using var _ambient = BattleAmbient.Enter(_ctx)` scope wraps
ripped from every accessor and mutator; EngineGlobalInit.WirePerSessionGameMgr
takes GameMgr as a param and runs from SessionBattleEngine.SetupInternal
BEFORE mgr construction.

Test side: TestBattleScope deleted; 18 fixture [SetUp]s migrated to
`HeadlessEngineEnv.EnsureProcessGlobals()`; MultiInstanceEngineTests rewritten
around per-mgr construction (GetIns() → null is the pinned invariant).

## Regression fixes

- **chunk-48** (MulliganCtrl): chunk-35's `= null` stubs on card lookups broke
  the live receive-driven Deal path (BattlePlayerBase.DrawCard NRE'd downstream
  of NetworkPlayerMulliganCtrl.StartMulliganVfx). Restored the three lookups
  via `_battlePlayer.BattleMgr.GetBattleCardIdx`. Engine tests were satisfied
  by the WireMulliganPhase seam; unit tests exposed the live-path gap.

## Ship state

- SVSim.BattleEngine.Tests: 56/56 pass, 2 skip
- SVSim.UnitTests: 1554/1554 pass (was 1523/31-fail before chunk 48)
- Solution build: 0 source warnings (40 pre-existing NU1902 MessagePack CVEs
  in SVSim.EmulatedEntrypoint, unrelated)
- Sequential PVP smoke: verified live (two back-to-back battles, no regression
  on cleanup/spinup)
- Concurrent PVP smoke: verified live

Adds tools/engine-port/ClosureAnalyzer/ — the Roslyn transitive-type-closure
analyzer needed to make future cascade cleanup safe (per feedback memory
"Engine cleanup needs closure tool" from the 2026-06-28 pass-3 failure).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.BattleEngine/Engine/MyPageCardPanel.cs

@@ -5,14 +5,6 @@ using Wizard;
 
 public class MyPageCardPanel : MonoBehaviour
 {
-	[SerializeField]
-	private UITexture _texture;
-
-	[SerializeField]
-	private string _filePath;
-
-	[SerializeField]
-	private UILabel _titleLabel;
 
 	[SerializeField]
 	private GameObject _effect;
@@ -30,12 +22,6 @@ public class MyPageCardPanel : MonoBehaviour
 
 	private Vector3? _savedPosition;
 
-	public UITexture Texture => _texture;
-
-	public string FilePath => _filePath;
-
-	protected UILabel TitleLabel => _titleLabel;
-
 	public int Index { get; set; }
 
 	public bool EffectActive
@@ -49,29 +35,6 @@ public class MyPageCardPanel : MonoBehaviour
 		}
 	}
 
-	public NetworkDefine.MAINTENANCE_TYPE MaintenanceType
-	{
-		get
-		{
-			return maintenanceType;
-		}
-		set
-		{
-			enableMaintenanceCheck = true;
-			maintenanceType = value;
-		}
-	}
-
-	public virtual string GetResourcePath(bool isfetch)
-	{
-		return Toolbox.ResourcesManager.GetAssetTypePath(FilePath, ResourcesManager.AssetLoadPathType.CardMenu, isfetch);
-	}
-
-	public void AttachCardPanelTexture()
-	{
-		Texture.mainTexture = Toolbox.ResourcesManager.LoadObject(GetResourcePath(isfetch: true)) as Texture;
-	}
-
 	public virtual void CheckMaintenanceType()
 	{
 		if (!enableMaintenanceCheck)
@@ -114,7 +77,7 @@ public class MyPageCardPanel : MonoBehaviour
 	{
 		if (_maintenancePlate == null)
 		{
-			GameObject prefab = GameMgr.GetIns().GetPrefabMgr().Get("Prefab/UI/Menu/CardPanelMaintenancePlate");
+			GameObject prefab = null; // Pre-Phase-5b: no PrefabMgr headless
 			_maintenancePlate = NGUITools.AddChild(base.gameObject, prefab).GetComponent<CardPanelMaintenancePlate>();
 		}
 		_maintenancePlate.gameObject.SetActive(value: true);
@@ -131,11 +94,6 @@ public class MyPageCardPanel : MonoBehaviour
 		UIManager.SetObjectToGrey(base.gameObject, b: false);
 	}
 
-	public void SetDisableForTutorial(bool isGrey)
-	{
-		UIManager.SetObjectToGrey(base.gameObject, isGrey);
-	}
-
 	public Vector3 SavePosition()
 	{
 		_savedPosition = base.transform.localPosition;
@@ -146,11 +104,4 @@ public class MyPageCardPanel : MonoBehaviour
 	{
 		base.transform.localPosition = _savedPosition.Value;
 	}
-
-	public IEnumerator DisablePanel(string text)
-	{
-		ShowMaintenance();
-		yield return null;
-		_maintenancePlate.SetText(text);
-	}
 }