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/CardMake.cs

@@ -6,9 +6,6 @@ using Wizard;
 
 public class CardMake : MonoBehaviour
 {
-	public const int CAN_CREATE_MAX = 3;
-
-	public const string FORMAT_CARD_CRAFT_PARAM = "{0},{1}";
 
 	private IDictionary<string, string> DestructDict;
 
@@ -34,7 +31,7 @@ public class CardMake : MonoBehaviour
 		{
 			DestructDict.Clear();
 		}
-		int possessionCardNum = GameMgr.GetIns().GetDataMgr().GetPossessionCardNum(cardId, isIncludingSpotCard: false);
+		int possessionCardNum = 0; // Pre-Phase-5b: headless has no user inventory
 		DestructDict = new Dictionary<string, string>();
 		DestructDict.Add(cardId.ToString(), "1," + possessionCardNum);
 		DestructCard();
@@ -42,9 +39,10 @@ public class CardMake : MonoBehaviour
 
 	private void DestructCard()
 	{
-		CardDestructTask cardDestructTask = GameMgr.GetIns().GetCardDestructTask();
-		cardDestructTask.SetParameter(DestructDict);
-		StartCoroutine(Toolbox.NetworkManager.Connect(cardDestructTask, OnRequestFinishDestruct, OnError, OnError));
+		// Pre-Phase-5b: fired CardDestructTask via NetworkManager. Headless has no wire
+		// task service; short-circuit straight to the success callback so the UI event
+		// chain (OnRequestFinishDestruct → TriggerUpdateUserDeck → OnClose) still fires.
+		OnRequestFinishDestruct(default(NetworkTask.ResultCode));
 	}
 
 	private void OnRequestFinishDestruct(NetworkTask.ResultCode error)
@@ -88,16 +86,15 @@ public class CardMake : MonoBehaviour
 		{
 			_craftDict.Clear();
 		}
-		int possessionCardNum = GameMgr.GetIns().GetDataMgr().GetPossessionCardNum(cardId, isIncludingSpotCard: false);
+		int possessionCardNum = 0; // Pre-Phase-5b: headless has no user inventory
 		_craftDict.Add(cardId.ToString(), $"{1},{possessionCardNum}");
 		CraftCard();
 	}
 
 	private void CraftCard()
 	{
-		CardCreateTask cardCreateTask = GameMgr.GetIns().GetCardCreateTask();
-		cardCreateTask.SetParameter(_craftDict);
-		StartCoroutine(Toolbox.NetworkManager.Connect(cardCreateTask, OnRequestFinishCraft, OnError, OnError));
+		// Pre-Phase-5b: fired CardCreateTask via NetworkManager. See DestructCard.
+		OnRequestFinishCraft(default(NetworkTask.ResultCode));
 	}
 
 	private void OnRequestFinishCraft(NetworkTask.ResultCode error)
@@ -112,27 +109,6 @@ public class CardMake : MonoBehaviour
 		}
 	}
 
-	public void StartDestructAll(IDictionary<string, string> destructDict, Action onFinishCallBack = null)
-	{
-		_onFinishCardDestruct = onFinishCallBack;
-		DestructDict = destructDict;
-		if (DestructDict.Count > 0)
-		{
-			DestructCard();
-		}
-	}
-
-	public void StartDestructAll(IDictionary<int, int> destructDict, Action callback = null)
-	{
-		Dictionary<string, string> dictionary = new Dictionary<string, string>();
-		foreach (KeyValuePair<int, int> item in destructDict)
-		{
-			string value = CreateRequestParam(item.Key, item.Value);
-			dictionary.Add(item.Key.ToString(), value);
-		}
-		StartDestructAll(dictionary, callback);
-	}
-
 	public void StartCraftAll(IDictionary<int, int> craftDict)
 	{
 		if (_craftDict == null)
@@ -159,7 +135,7 @@ public class CardMake : MonoBehaviour
 
 	private string CreateRequestParam(int cardId, int num)
 	{
-		int possessionCardNum = GameMgr.GetIns().GetDataMgr().GetPossessionCardNum(cardId, isIncludingSpotCard: false);
+		int possessionCardNum = 0; // Pre-Phase-5b: headless has no user inventory
 		return $"{num},{possessionCardNum}";
 	}