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/Wizard/SealedData.cs

@@ -7,19 +7,6 @@ namespace Wizard;
 
 public class SealedData
 {
-	private const int ACQUIRED_NORMAL_CARDID_END = 6;
-
-	private const int ACQUIRED_PREMIUM_CARDID_END = 7;
-
-	private const int PHANTOM_NORMAL_CARDID_END = 8;
-
-	private const int PHANTOM_PREMIUM_CARDID_END = 9;
-
-	public const int PHANTOM_CARD_SLEEVE_ID = 5070001;
-
-	public const int GACHA_RESOURCE_ID = 70;
-
-	public const GenerateDeckCodeTask.SubmitDeckType DECK_CODE_TYPE = GenerateDeckCodeTask.SubmitDeckType.SEALED;
 
 	private List<SealedCardInfo> _registeredSealedCardInfoList = new List<SealedCardInfo>();
 
@@ -65,8 +52,6 @@ public class SealedData
 
 	public bool? IsCompletedDeck { get; private set; }
 
-	public bool RegisteredSealedCardExists => _registeredSealedCardInfoList.Count > 0;
-
 	public bool IsSpecialEffect { get; private set; }
 
 	public void SetEntryInfo(JsonData rootData)
@@ -85,8 +70,7 @@ public class SealedData
 			if (jsonData2 != null)
 			{
 				SelectedClassId = jsonData2.ToInt();
-				GameMgr.GetIns().GetDataMgr().GetClassPrm(SelectedClassId.Value)
-					.SetCurrentCharaId(jsonData["leader_skin_id"].ToInt());
+				// Pre-Phase-5b: dropped class-prm chara-id write; headless has no class prm map.
 			}
 		}
 	}
@@ -187,7 +171,7 @@ public class SealedData
 			list.ForEach(RegisterSealedCard);
 			list.ForEach(delegate(SealedCardInfo info)
 			{
-				GameMgr.GetIns().GetDataMgr().SetIsNewCard(info.OriginalCardId, isNew: false);
+				// Pre-Phase-5b: SetIsNewCard write dropped; headless has no user card state.
 			});
 		}
 		list.Sort(delegate(SealedCardInfo a, SealedCardInfo b)
@@ -283,17 +267,13 @@ public class SealedData
 	private void RegisterSealedCard(SealedCardInfo cardInfo)
 	{
 		CardMaster instance = CardMaster.GetInstance(CardMaster.CardMasterId.Default);
-		DataMgr dataMgr = GameMgr.GetIns().GetDataMgr();
 		int sealedCardId = cardInfo.SealedCardId;
 		int originalCardId = cardInfo.OriginalCardId;
 		_registeredSealedCardInfoList.Add(cardInfo);
 		CardParameter cardParam = instance.GetCardParameterFromId(originalCardId).Clone(sealedCardId);
-		if (!cardInfo.IsPhantom)
-		{
-			dataMgr.SetIsNewCard(sealedCardId, dataMgr.IsNewCard(originalCardId));
-		}
+		// Pre-Phase-5b: DataMgr.SetIsNewCard + RegisterUserOwnCardData dropped; headless has
+		// no user card state to update.
 		instance.RegisterCardParameter(sealedCardId, cardParam);
-		dataMgr.RegisterUserOwnCardData(sealedCardId, cardInfo.OwnNum);
 		RegisterSealedCardInAllCardIdList(sealedCardId);
 	}
 
@@ -326,9 +306,8 @@ public class SealedData
 	private void UnregisterSealedCard(int sealedCardId)
 	{
 		_registeredSealedCardInfoList.RemoveAll((SealedCardInfo x) => x.SealedCardId == sealedCardId);
-		DataMgr dataMgr = GameMgr.GetIns().GetDataMgr();
 		CardMaster.GetInstance(CardMaster.CardMasterId.Default).UnregisterCardParameter(sealedCardId);
-		dataMgr.UnregisterUserOwnCardData(sealedCardId);
+		// Pre-Phase-5b: DataMgr.UnregisterUserOwnCardData dropped; headless has no user card state.
 		CardMaster.GetInstance(CardMaster.CardMasterId.Default).GetAllCardIds().Remove(sealedCardId);
 	}
 
@@ -340,11 +319,6 @@ public class SealedData
 		return originalCardId / 10 * 10 + num;
 	}
 
-	private static int? ConvertToOriginalCardId(int sealedCardId)
-	{
-		return Data.ArenaData.SealedData.GetSealedCardInfo(sealedCardId)?.OriginalCardId;
-	}
-
 	public static bool IsPhantomCard(int cardId)
 	{
 		return Data.ArenaData.SealedData.GetSealedCardInfo(cardId)?.IsPhantom ?? false;