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.Battle.UI/LogType.cs

@@ -2,87 +2,10 @@ namespace Wizard.Battle.UI;
 
 public enum LogType
 {
-	Null,
 	Turn,
 	Cost,
-	MulliganChanged,
-	BuffAdd,
-	BuffMultiply,
-	BuffSetAttack,
-	BuffSetLife,
-	BuffAddMaxLife,
-	BuffInHandAdd,
-	Gain,
-	AttachSkill,
-	Heal,
-	HealSkill,
-	Damage,
-	DamageSkill,
-	CantAttack,
 	ChantCount,
-	GiveWhiteRitualStack,
-	DepriveWhiteRitualStack,
-	AttackCountRecovery,
-	ChangeDeck,
-	PlayChoice,
-	Attack,
-	AttackCounter,
-	Metamorphose,
-	UniteMaterial,
 	Play,
-	Summon,
-	WhenPlay,
 	WhenDestroy,
-	WhenLeave,
-	WhenAttackSelfAndOtherAfter,
-	OtherEffect,
-	EP,
-	PP,
-	PPMax,
-	AddCost,
-	SetCost,
-	DrawToken,
-	DrawCard,
 	Enhance,
-	Accelerate,
-	Crystallize,
-	OverDraw,
-	OverDrawOnTurnStartDraw,
-	UsePp,
-	OpenDrawCard,
-	ReturnCard,
-	Discard,
-	BanishHand,
-	BanishDeck,
-	Destroy,
-	Banish,
-	Evolution,
-	EvolutionSkill,
-	ChangeCemetery,
-	AwakeBySkill,
-	AwakeByTurnStart,
-	BerserkBySkill,
-	BerserkByWar,
-	Necromance,
-	Lose,
-	ChangeClan,
-	ChangeTribe,
-	ChangePlayCount,
-	BattleLogCardList,
-	DeckSummonCardList,
-	FusionInfoList,
-	FusionIngredientList,
-	BurialRite,
-	ShortageDeckWin,
-	CopiedSkill,
-	RandomArray,
-	Fusion,
-	FusionIngredient,
-	ClearDestroyedCardList,
-	ClearSummonedCardList,
-	Geton,
-	GetonIngredient,
-	GetoffIngredient,
-	ReserveToken,
-	NotConsumeEp
-}
+	Necromance}

SVSim.BattleEngine/Engine/Wizard.Battle.UI/SkillGainType.cs

@@ -23,7 +23,6 @@ public enum SkillGainType
 	Indestructible,
 	CantActivateFanfare,
 	CantActivateShortageDeckWin,
-	ForceAttack,
 	ForceSkillTarget,
 	AttractSkillTarget,
 	Independent,
@@ -34,14 +33,8 @@ public enum SkillGainType
 	DecreaseTurnPP,
 	CantPlayUnit,
 	CantSummon,
-	RepeatFanfare,
 	RepeatLastWord,
 	DamageCut,
 	AttackByLife,
-	Reflection,
 	DontConsumeEp,
-	RobLastWords,
-	ShortageDeckWin,
-	NotDecreasePP,
-	Max
-}
+	NotDecreasePP}