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/Cute/CuteNetworkDefine.cs

@@ -37,61 +37,13 @@ public static class CuteNetworkDefine
 		GOOGLE_PLAY,
 		GAME_CENTER,
 		FACEBOOK,
-		DMM,
-		STEAM,
 		APPLE_ID
 	}
 
 	public enum CONNECT_TYPE
 	{
-		SOCIAL_ACCOUNT_CONNECT = 1,
-		SOCIAL_ACCOUNT_DISCONNECT,
-		SOCIAL_ACCOUNT_GAME_DATA_UPDATE,
-		TRANS_CODE_GAME_DATA_UPDATE
 	}
 
-	public const int API_RESULT_SUCCESS_CODE = 1;
-
-	public const int RESULT_CODE_DATABASE_ERROR = 100;
-
-	public const int RESULT_CODE_MAINTENANCE_COMMON = 101;
-
-	public const int RESULT_CODE_SERVER_ERROR = 102;
-
-	public const int API_RESULT_SESSION_ERROR = 201;
-
-	public const int RESULT_CODE_ACCOUNT_BLOCK_ERROR = 203;
-
-	public const int RESULT_CODE_ACCOUNT_LIMITED_BLOCK_ERROR = 217;
-
-	public const string ACCOUNT_LIMITED_BLOCK_END_TIME = "account_block_end_time";
-
-	public const int RESULT_CODE_NETEASE_ACCOUNT_BLOCK_ERROR = 330;
-
-	public const int API_RESULT_VERSION_ERROR = 204;
-
-	public const int RESULT_CODE_PROCESSED_ERROR = 213;
-
-	public const int RESULT_CODE_PAYMENT_VALIDATION_ERROR = 308;
-
-	public const int RESULT_CODE_DMM_ONETIMETOKEN_EXPIRED = 317;
-
-	public const int RESULT_CODE_SOLO_PLAY_ALREADY_FINISH = 1352;
-
-	public const int RESULT_CODE_MAINTENANCE_FROM = 2000;
-
-	public const int RESULT_CODE_MAINTENANCE_TO = 2999;
-
-	public const string MAINTENACE_END_TIME = "maintenance_end_time";
-
-	public const int RESULT_CODE_MAINTENANCE_CARD_TWO_PICK = 1710;
-
-	public const int RESULT_CODE_MAINTENANCE_CARD_OPEN_SIX = 5013;
-
-	public const int RESULT_CODE_ALREADY_BATTLE_RESULT = 3502;
-
-	public const int RC_OPEN_ROOM_SET_DECK_IN_BATTLE_PHASE = 1768;
-
 	public static Dictionary<ApiType, string> ApiUrlList = new Dictionary<ApiType, string>
 	{
 		{