diff --git a/SVSim.BattleEngine.Tests/BattleCardViewShimTests.cs b/SVSim.BattleEngine.Tests/BattleCardViewShimTests.cs
new file mode 100644
index 0000000..c929b01
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/BattleCardViewShimTests.cs
@@ -0,0 +1,56 @@
+using NUnit.Framework;
+using UnityEngine;
+using Wizard.Battle.View;
+
+namespace SVSim.BattleEngine.Tests
+{
+ // Regression for the in-play metamorphose NRE diagnosed 2026-06-07 (bid 283192092460).
+ //
+ // The IsRecovery card-create delegate (NetworkBattleManagerBase.cs:379) passes null for the
+ // cardGameObject, which left BattleCardView.GameObject null. Skill_metamorphose.cs:147 in the
+ // IsInplay branch then NRE'd on the unguarded
+ // metamorphosedCard.BattleCardView.GameObject.transform.rotation = Quaternion.identity
+ // — a purely cosmetic transform reset that has no corresponding state mutation, but tripped over
+ // null-GameObject before the surrounding mutations (ReplaceInPlay, SetUpInplay,
+ // FlagCardAsDestroyedBySkill, RemoveFromInPlay) could complete.
+ //
+ // Fix: ViewUiTouchStubs.cs's BattleCardView.GameObject is now lazily non-null (matches the
+ // existing Component.gameObject pattern at UnityShim.cs:94). The shim materializes a no-op
+ // GameObject on first read; the cosmetic touch resolves to a no-op assignment instead of NRE.
+ [TestFixture]
+ public class BattleCardViewShimTests
+ {
+ [Test]
+ public void GameObject_is_lazily_non_null_so_unguarded_recovery_touches_no_op()
+ {
+ var view = new BattleCardView();
+
+ Assert.That(view.GameObject, Is.Not.Null,
+ "BattleCardView.GameObject must be lazily non-null in the shim so unguarded " +
+ "Unity touches on the IsRecovery card-create path (which passes null cardGameObject) " +
+ "resolve to no-ops instead of NRE-ing.");
+
+ Assert.That(view.GameObject.transform, Is.Not.Null,
+ "GameObject.transform must follow the shim's lazy non-null Component pattern (UnityShim.cs:94).");
+
+ Assert.DoesNotThrow(() => view.GameObject.transform.rotation = Quaternion.identity,
+ "Skill_metamorphose.cs:147's cosmetic transform.rotation reset on the in-play branch must " +
+ "not throw in the headless IsRecovery path (live bid 283192092460: A's Petrification " +
+ "on B's in-play card).");
+ }
+
+ [Test]
+ public void GameObject_is_stable_across_reads_so_a_set_followed_by_read_returns_the_same_instance()
+ {
+ // Lazy materialization caches the GameObject on first read, so subsequent reads return
+ // the same instance — required for any code path that reads .GameObject, mutates it,
+ // and reads again (e.g. follower position/rotation/scale set in sequence).
+ var view = new BattleCardView();
+ var first = view.GameObject;
+ var second = view.GameObject;
+ Assert.That(second, Is.SameAs(first),
+ "lazy GameObject must cache; otherwise the second read returns a fresh instance " +
+ "and any mutation on the first read is lost.");
+ }
+ }
+}
diff --git a/SVSim.BattleEngine.Tests/Fixtures/battle_test_fresh_cl1.ndjson b/SVSim.BattleEngine.Tests/Fixtures/battle_test_fresh_cl1.ndjson
new file mode 100644
index 0000000..3542383
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/Fixtures/battle_test_fresh_cl1.ndjson
@@ -0,0 +1,109 @@
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index 0000000..105bc48
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+{"ts":"2026-06-07T12:07:52.0776073Z","direction":"send","uri":"Echo","body":{"orderList":[{"trigger":{"isSelf":0,"turnEndRestore":[4,5,19,6,32,23],"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":0,"maxAtk":5}},{"trigger":{"isSelf":0,"avarice":0}}]}}
+{"ts":"2026-06-07T12:07:52.3771546Z","direction":"receive","uri":null,"body":{"uri":"TurnEnd","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":58,"playSeq":38,"turnState":0,"resultCode":1}}
+{"ts":"2026-06-07T12:07:52.3931550Z","direction":"send","uri":"Judge","body":{"battleCode":{"key1":"153","key2":"540","key3":"0","key4":"154","key5":"393","key6":"1021322270"}}}
+{"ts":"2026-06-07T12:07:52.4097475Z","direction":"receive","uri":null,"body":{"uri":"Judge","viewerId":6,"uuid":"10d8e723-ac93-47a5-b307-cf3a0d6026e4","try":1,"cat":1,"bid":"907324319325","pubSeq":52,"playSeq":39,"spin":0,"resultCode":1}}
+{"ts":"2026-06-07T12:07:52.4689367Z","direction":"send","uri":"TurnStart","body":{"orderList":[{"playerParam":{"isSelf":1,"maxPP":1}},{"trigger":{"isSelf":1,"turnStartRestore":1,"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":0,"turnDamageFromUnit":6}},{"move":{"idx":[18],"isSelf":1,"from":0,"to":10}},{"trigger":{"isSelf":1,"resonance":0}}],"actionSeq":36}}
+{"ts":"2026-06-07T12:07:57.1625968Z","direction":"send","uri":"PlayActions","body":{"playIdx":34,"orderList":[{"move":{"idx":[34],"isSelf":1,"from":10,"to":20}},{"move":{"idx":[5],"isSelf":1,"from":0,"to":10}},{"trigger":{"isSelf":1,"resonance":1}},{"trigger":{"isSelf":1,"avarice":1}}],"uList":[{"idxList":[5],"from":0,"to":10,"isSelf":1,"skill":"34|28|0"}],"type":30}}
+{"ts":"2026-06-07T12:07:58.2473269Z","direction":"send","uri":"PlayActions","body":{"playIdx":18,"orderList":[{"move":{"idx":[18],"isSelf":1,"from":10,"to":20}}],"type":30}}
+{"ts":"2026-06-07T12:08:02.7615951Z","direction":"send","uri":"PlayActions","body":{"playIdx":5,"orderList":[{"move":{"idx":[5],"isSelf":1,"from":10,"to":20}}],"type":30}}
+{"ts":"2026-06-07T12:08:05.7352832Z","direction":"send","uri":"TurnEndActions","body":{"orderList":[{"trigger":{"isSelf":1,"turnEndRestore":[2,3,16,15,24,11],"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":1,"maxAtk":1}},{"move":{"idx":[42],"isSelf":0,"from":20,"to":30,"hasGuard":[42]}},{"trigger":{"isSelf":1,"avarice":0}}]}}
+{"ts":"2026-06-07T12:08:06.2301214Z","direction":"send","uri":"TurnEnd","body":{"battleCode":{"key1":"152","key2":"302","key3":"326133205","key4":"156","key5":"393","key6":"121011060"},"type":0,"actionSeq":41,"cemetery":[3,7]}}
+{"ts":"2026-06-07T12:08:06.3303197Z","direction":"receive","uri":null,"body":{"uri":"TurnStart","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":65,"playSeq":40,"spin":0,"resultCode":1}}
+{"ts":"2026-06-07T12:08:06.3513355Z","direction":"send","uri":"Echo","body":{"orderList":[{"playerParam":{"isSelf":0,"maxPP":1}},{"trigger":{"isSelf":0,"turnStartRestore":1,"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":1,"turnDamageFromUnit":0}},{"move":{"idx":[38],"isSelf":0,"from":0,"to":10}},{"trigger":{"isSelf":0,"resonance":0}}]}}
+{"ts":"2026-06-07T12:08:17.8463749Z","direction":"receive","uri":null,"body":{"uri":"PlayActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":68,"playSeq":41,"playIdx":19,"type":30,"knownList":[{"idx":19,"cardId":127011010,"to":20,"spellboost":0,"attachTarget":"","cost":0,"clan":0,"tribe":"0"}],"keyAction":[{"type":1,"cardId":127011010}]}}
+{"ts":"2026-06-07T12:08:17.9224312Z","direction":"send","uri":"Echo","body":{"playIdx":19,"orderList":[{"move":{"idx":[19],"isSelf":0,"from":10,"to":20}},{"add":{"idx":[43],"isSelf":0,"card":{"candidates":[121011010,120011010]},"isChoice":"1"}},{"move":{"idx":[43],"isSelf":0,"from":50,"to":10}}],"type":30}}
+{"ts":"2026-06-07T12:08:21.3856074Z","direction":"receive","uri":null,"body":{"uri":"PlayActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":71,"playSeq":42,"playIdx":4,"type":31,"knownList":[{"idx":4,"cardId":101324050,"to":30,"spellboost":0,"attachTarget":"","cost":0,"clan":0,"tribe":"0"}],"oppoTargetList":[{"targetIdx":5,"isSelf":0}]}}
+{"ts":"2026-06-07T12:08:21.5844099Z","direction":"send","uri":"Echo","body":{"playIdx":4,"orderList":[{"move":{"idx":[4],"isSelf":0,"from":10,"to":30}},{"alter":{"idx":[5,6,32,23,38,43],"isSelf":0,"type":"add","spellboost":"a1","attachTarget":"33"}},{"metamorphose":{"idx":[5],"isSelf":1,"after":{"cardId":900311020}}}],"type":31}}
+{"ts":"2026-06-07T12:08:25.9743530Z","direction":"receive","uri":null,"body":{"uri":"PlayActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":74,"playSeq":43,"playIdx":5,"type":31,"knownList":[{"idx":5,"cardId":101334030,"to":30,"spellboost":2,"attachTarget":"","cost":3,"clan":3,"tribe":"0"}],"oppoTargetList":[{"targetIdx":34,"isSelf":0}]}}
+{"ts":"2026-06-07T12:08:26.1638091Z","direction":"send","uri":"Echo","body":{"playIdx":5,"orderList":[{"move":{"idx":[5],"isSelf":0,"from":10,"to":30}},{"alter":{"idx":[6,32,23,38,43],"isSelf":0,"type":"add","spellboost":"a1","attachTarget":"36"}},{"move":{"idx":[34],"isSelf":1,"from":20,"to":30}},{"add":{"idx":[44],"isSelf":0,"card":{"cardId":900334010}}},{"move":{"idx":[44],"isSelf":0,"from":50,"to":10}}],"type":31}}
+{"ts":"2026-06-07T12:08:29.6025555Z","direction":"receive","uri":null,"body":{"uri":"TurnEndActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":75,"playSeq":44}}
+{"ts":"2026-06-07T12:08:29.6190527Z","direction":"send","uri":"Echo","body":{"orderList":[{"trigger":{"isSelf":0,"turnEndRestore":[6,32,23,38,43,44],"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":0,"maxAtk":3}}]}}
+{"ts":"2026-06-07T12:08:30.1015223Z","direction":"receive","uri":null,"body":{"uri":"TurnEnd","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":76,"playSeq":45,"turnState":0,"resultCode":1}}
+{"ts":"2026-06-07T12:08:30.1180409Z","direction":"send","uri":"Judge","body":{"battleCode":{"key1":"154","key2":"302","key3":"1000422107","key4":"162","key5":"770","key6":"248022140"}}}
+{"ts":"2026-06-07T12:08:30.1345601Z","direction":"receive","uri":null,"body":{"uri":"Judge","viewerId":6,"uuid":"10d8e723-ac93-47a5-b307-cf3a0d6026e4","try":1,"cat":1,"bid":"907324319325","pubSeq":64,"playSeq":46,"spin":0,"resultCode":1}}
+{"ts":"2026-06-07T12:08:30.1768361Z","direction":"send","uri":"TurnStart","body":{"orderList":[{"playerParam":{"isSelf":1,"maxPP":1}},{"trigger":{"isSelf":1,"turnStartRestore":1,"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":0,"turnDamageFromUnit":0}},{"move":{"idx":[35],"isSelf":1,"from":0,"to":10}},{"trigger":{"isSelf":1,"resonance":0}}],"actionSeq":46}}
+{"ts":"2026-06-07T12:08:37.7130477Z","direction":"send","uri":"PlayActions","body":{"playIdx":15,"orderList":[{"move":{"idx":[15],"isSelf":1,"from":10,"to":20}}],"type":30}}
+{"ts":"2026-06-07T12:08:38.5902629Z","direction":"send","uri":"TurnEndActions","body":{"orderList":[{"trigger":{"isSelf":1,"turnEndRestore":[2,3,16,24,11,35],"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":1,"maxAtk":5}}]}}
+{"ts":"2026-06-07T12:08:39.0894170Z","direction":"send","uri":"TurnEnd","body":{"battleCode":{"key1":"156","key2":"417","key3":"1101543355","key4":"162","key5":"770","key6":"248022140"},"type":0,"actionSeq":49,"cemetery":[4,9]}}
+{"ts":"2026-06-07T12:08:40.0572510Z","direction":"receive","uri":null,"body":{"uri":"TurnStart","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":81,"playSeq":47,"spin":0,"resultCode":1}}
+{"ts":"2026-06-07T12:08:40.0784574Z","direction":"send","uri":"Echo","body":{"orderList":[{"playerParam":{"isSelf":0,"maxPP":1}},{"trigger":{"isSelf":0,"turnStartRestore":1,"canEvolve":1,"isUnlimited":1}},{"trigger":{"isSelf":1,"turnDamageFromUnit":0}},{"move":{"idx":[20],"isSelf":0,"from":0,"to":10}},{"trigger":{"isSelf":0,"resonance":1}}]}}
+{"ts":"2026-06-07T12:08:44.0705950Z","direction":"receive","uri":null,"body":{"uri":"PlayActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":82,"playSeq":48,"playIdx":20,"type":30,"knownList":[{"idx":20,"cardId":101311010,"to":20,"spellboost":0,"attachTarget":"","cost":0,"clan":0,"tribe":"0"}]}}
+{"ts":"2026-06-07T12:08:44.2734716Z","direction":"send","uri":"Echo","body":{"playIdx":20,"orderList":[{"move":{"idx":[20],"isSelf":0,"from":10,"to":20}}],"type":30}}
+{"ts":"2026-06-07T12:08:49.2868793Z","direction":"receive","uri":null,"body":{"uri":"PlayActions","viewerId":7,"uuid":"a7ee9b5f-b0c5-48de-82b1-1a2468cfc696","try":1,"cat":1,"bid":"907324319325","pubSeq":83,"playSeq":49,"playIdx":23,"type":30,"knownList":[{"idx":23,"cardId":101321070,"to":20,"spellboost":0,"attachTarget":"","cost":0,"clan":0,"tribe":"0"}]}}
+{"ts":"2026-06-07T12:08:49.5008504Z","direction":"send","uri":"Echo","body":{"playIdx":23,"orderList":[{"move":{"idx":[23],"isSelf":0,"from":10,"to":20}}],"type":30}}
+{"ts":"2026-06-07T12:09:11.1269227Z","direction":"receive","uri":null,"body":{"uri":"BattleFinish","viewerId":999999999,"uuid":"node-stub","try":0,"cat":1,"result":201,"resultCode":1}}
diff --git a/SVSim.BattleEngine.Tests/HeadlessHandViewStubTests.cs b/SVSim.BattleEngine.Tests/HeadlessHandViewStubTests.cs
new file mode 100644
index 0000000..1f6598a
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/HeadlessHandViewStubTests.cs
@@ -0,0 +1,64 @@
+using NUnit.Framework;
+using Wizard.Battle.View;
+using Wizard.Battle.View.Vfx;
+
+namespace SVSim.BattleEngine.Tests
+{
+ // Regression for the Heal-triggered Skill_heal NRE diagnosed 2026-06-07 (bid 799755786270).
+ //
+ // A follower with a `when_spell_play` Heal trigger fires on a spell play and routes through
+ // Skill_heal.Start → ClassBattleCardBase.ApplyHealing → CreatePullHandInVfx
+ // → HandViewBase.HandUnfocus (HandViewBase.cs:124-131)
+ // The base implementation does `_handControl.SetHandState(HandControl.HandState.Unfocus)`.
+ // HeadlessHandViewStub.CreateHandControl returns null in headless, so `_handControl` is null
+ // and the base method NREs unconditionally — even when the heal amount is 0.
+ //
+ // The fix overrides HandUnfocus/HandFocus/FocusRearrangeHandHand on the stub to return
+ // NullVfx without touching `_handControl`. These are PURE PRESENTATION methods (visual
+ // ease-in/ease-out of the hand cards) — no game-state implications — so no-op'ing them
+ // headless is safe; the surrounding state mutations in ApplyHealing (HealLife, skill triggers)
+ // still run.
+ //
+ // Pattern parity with the metamorphose-NRE shim fix in ViewUiTouchStubs.cs (BattleCardView.GameObject
+ // lazy non-null): production Unity touches that the headless engine must no-op rather than throw.
+ [TestFixture]
+ public class HeadlessHandViewStubTests
+ {
+ [Test]
+ public void HandUnfocus_does_not_throw_and_returns_non_null_vfx()
+ {
+ var stub = HeadlessHandViewStub.Instance;
+
+ VfxBase vfx = null;
+ Assert.DoesNotThrow(() => vfx = stub.HandUnfocus(),
+ "HandUnfocus must no-op headlessly — the live regression (bid 799755786270) crashed " +
+ "Skill_heal.Start when a when_spell_play Heal trigger fired with heal:0 because the " +
+ "base HandUnfocus dereferences a null _handControl.");
+ Assert.That(vfx, Is.Not.Null, "must return a non-null Vfx (caller registers it on a sequential player).");
+ }
+
+ [Test]
+ public void HandFocus_does_not_throw_and_returns_non_null_vfx()
+ {
+ var stub = HeadlessHandViewStub.Instance;
+
+ VfxBase vfx = null;
+ Assert.DoesNotThrow(() => vfx = stub.HandFocus(),
+ "HandFocus is the sister cosmetic touch (called from CreatePullHandOutVfx on the " +
+ "OWNER's turn). Same null _handControl, same headless no-op required.");
+ Assert.That(vfx, Is.Not.Null);
+ }
+
+ [Test]
+ public void FocusRearrangeHandHand_does_not_throw_and_returns_non_null_vfx()
+ {
+ var stub = HeadlessHandViewStub.Instance;
+
+ VfxBase vfx = null;
+ Assert.DoesNotThrow(() => vfx = stub.FocusRearrangeHandHand(),
+ "FocusRearrangeHandHand reads _handControl.IsHandStateFocus() before dispatching to " +
+ "HandFocus or HandUnfocus; the base implementation would NRE on the read.");
+ Assert.That(vfx, Is.Not.Null);
+ }
+ }
+}
diff --git a/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayFullInputDivergenceExperimentTests.cs b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayFullInputDivergenceExperimentTests.cs
new file mode 100644
index 0000000..c2f0924
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayFullInputDivergenceExperimentTests.cs
@@ -0,0 +1,275 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using NUnit.Framework;
+using SVSim.BattleNode.Protocol;
+using SVSim.BattleNode.Sessions.Engine;
+
+namespace SVSim.BattleEngine.Tests.SessionEngine
+{
+ ///
+ /// PHASE 4 — DECISIVE VERIFICATION (TEST-ONLY, no production fix, no Engine/*.cs edits).
+ ///
+ /// QUESTION: does feeding the headless shadow engine the FULL client inputs (server-authored
+ /// Deal/Swap/Ready setup frames for BOTH seats + the real per-seat idxChangeSeed) make its
+ /// recovery-mode draw recompute faithful, so the "Target card was not found in hand cards"
+ /// divergences vanish?
+ ///
+ /// This builds the explicit 2x2 {setup-frames ingested: yes/no} x {real seed: yes/no} divergence
+ /// table over the SAME fresh battle (907324319325, battle_test_fresh_cl1/cl2.ndjson), and — at the
+ /// FIRST remaining divergence — dumps the engine's hand indices/ids vs the wire's playIdx.
+ ///
+ /// SEEDING MECHANISM (clean, both seats): the seat-B Ready ingest throws an NRE headless (the
+ /// recovery deal path isn't headless-clean for the opponent seat), so the wire Ready cannot be
+ /// relied on to seat seat B's XorShift. To inject the real seed FAITHFULLY for BOTH seats without
+ /// depending on the throwing Ready, we call the test seam .
+ /// DebugSeedIdxChange(self, oppo) (-> BattleManagerBase.CreateXorShift) BEFORE the
+ /// mulligan-end frame, with the real per-seat seeds (seat A = cl1's Ready idxChangeSeed = 1430655717,
+ /// seat B = cl2's = 661650374). We ASSERT both SelfXorShiftActive and OppoXorShiftActive
+ /// are true after.
+ ///
+ /// SETUP-FRAME INGEST: identical mechanism to — a
+ /// single Deal (cl1's receive Deal seats BOTH hands), each seat's Swap (its mulligan),
+ /// each seat's Ready (mulligan-end). The {no-setup-frames} row SKIPS Deal/Swap/Ready entirely:
+ /// the engine's autonomous Setup hand stands, and we replay only the plays.
+ ///
+ [TestFixture]
+ [NonParallelizable]
+ public class CaptureReplayFullInputDivergenceExperimentTests
+ {
+ // Real per-seat idxChangeSeed carried by each client's Ready frame (given in the experiment brief;
+ // re-confirmed below against the captures).
+ private const int SeatASeed = 1430655717; // cl1 / seat A / player
+ private const int SeatBSeed = 661650374; // cl2 / seat B / opponent
+
+ private static readonly HashSet SkipUris = new()
+ {
+ nameof(NetworkBattleUri.Echo),
+ nameof(NetworkBattleUri.ChatStamp),
+ nameof(NetworkBattleUri.Gungnir),
+ };
+
+ private static readonly HashSet MulliganUris = new()
+ {
+ nameof(NetworkBattleUri.Deal),
+ nameof(NetworkBattleUri.Swap),
+ nameof(NetworkBattleUri.Ready),
+ };
+
+ private sealed record HandDump(string Seat, int PlayIdx, string Uri, string Reason,
+ IReadOnlyList<(int Index, int CardId)> SelfHand,
+ IReadOnlyList<(int Index, int CardId)> OppoHand,
+ bool PlayIdxInSelfHand, bool PlayIdxInOppoHand);
+
+ private sealed record Cell(
+ bool SetupFrames, bool RealSeed,
+ int Divergences, bool SelfXorActive, bool OppoXorActive,
+ HandDump? FirstNotFoundDump);
+
+ private static int ReadPlayIdx(string rawBody)
+ {
+ using var doc = JsonDocument.Parse(rawBody);
+ return doc.RootElement.TryGetProperty("playIdx", out var p) && p.TryGetInt32(out var v) ? v : -1;
+ }
+
+ // Snapshot a seat's hand as (engine Index, CardId) pairs. Reads through the SessionBattleEngine
+ // oracle accessors (HandCount/HandCardIndex/HandCardId).
+ private static List<(int, int)> HandSnapshot(SessionBattleEngine engine, bool seat)
+ {
+ var list = new List<(int, int)>();
+ int n = engine.HandCount(seat);
+ for (int i = 0; i < n; i++)
+ list.Add((engine.HandCardIndex(seat, i), engine.HandCardId(seat, i)));
+ return list;
+ }
+
+ private static Cell Run(bool setupFrames, bool realSeed)
+ {
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+
+ var deckA = CaptureReplay.SelfDeckFrom(cl1);
+ var deckB = CaptureReplay.SelfDeckFrom(cl2);
+ Assert.That(deckA, Is.Not.Empty);
+ Assert.That(deckB, Is.Not.Empty);
+
+ var engine = new SessionBattleEngine();
+ engine.Setup(masterSeed: CaptureReplay.SeedFrom(cl1), seatADeck: deckA, seatBDeck: deckB);
+ Assert.That(engine.IsReady, Is.True);
+
+ // Inject the real per-seat seed BEFORE mulligan-end (Ready). Clean both-seat activation via the
+ // CreateXorShift seam, sidestepping the seat-B Ready NRE.
+ if (realSeed)
+ engine.DebugSeedIdxChange(SeatASeed, SeatBSeed);
+
+ int divergences = 0;
+ HandDump? firstNotFound = null;
+
+ void Ingest(MsgEnvelope env, bool seat, string uri, string rawBody)
+ {
+ var r = engine.Receive(env, isPlayerSeat: seat);
+ if (!r.Diverged) return;
+ divergences++;
+ if (firstNotFound is null && (r.RejectReason ?? "").Contains("not found in hand"))
+ {
+ int playIdx = ReadPlayIdx(rawBody);
+ var self = HandSnapshot(engine, seat);
+ var oppo = HandSnapshot(engine, !seat);
+ firstNotFound = new HandDump(
+ seat ? "A" : "B", playIdx, uri, Trim(r.RejectReason),
+ self, oppo,
+ self.Any(h => h.Item1 == playIdx), oppo.Any(h => h.Item1 == playIdx));
+ }
+ }
+
+ CapturedFrame Receive(IReadOnlyList frames, string uri) =>
+ frames.First(f => f.Direction == "receive" && f.Uri == uri);
+
+ // --- Phase 1: setup frames (optional) ---------------------------------------------------------
+ if (setupFrames)
+ {
+ var deal = Receive(cl1, nameof(NetworkBattleUri.Deal));
+ Ingest(deal.Env, seat: true, nameof(NetworkBattleUri.Deal), deal.RawBody);
+ foreach (var (frames, seat) in new[] { (cl1, true), (cl2, false) })
+ {
+ var swap = Receive(frames, nameof(NetworkBattleUri.Swap));
+ Ingest(swap.Env, seat, nameof(NetworkBattleUri.Swap), swap.RawBody);
+ var ready = Receive(frames, nameof(NetworkBattleUri.Ready));
+ Ingest(ready.Env, seat, nameof(NetworkBattleUri.Ready), ready.RawBody);
+ }
+ }
+
+ bool selfActive = engine.SelfXorShiftActive;
+ bool oppoActive = engine.OppoXorShiftActive;
+
+ // Snapshot the engine's post-setup hands (after Deal/Swap/Ready) for the full-inputs cell, so the
+ // report can compare the engine's mulligan-resolved hand against the wire's Swap/Ready move list.
+ if (setupFrames && realSeed)
+ {
+ TestContext.WriteLine(" [post-setup] engine SELF (seat A) hand: " +
+ string.Join(" ", HandSnapshot(engine, true).Select(h => $"(idx={h.Item1},cid={h.Item2})")));
+ TestContext.WriteLine(" [post-setup] engine OPPO (seat B) hand: " +
+ string.Join(" ", HandSnapshot(engine, false).Select(h => $"(idx={h.Item1},cid={h.Item2})")));
+ }
+
+ // --- Phase 2: replay both clients' interleaved SENDS (the plays) ------------------------------
+ var sends = SendsWithRawBody(cl1, cl2)
+ .Where(x => !SkipUris.Contains(x.Frame.Uri))
+ .ToList();
+ foreach (var x in sends)
+ Ingest(x.Frame.Env, x.Seat, x.Frame.Uri, x.Frame.RawBody);
+
+ return new Cell(setupFrames, realSeed, divergences, selfActive, oppoActive, firstNotFound);
+ }
+
+ private static IEnumerable<(CapturedFrame Frame, bool Seat)> SendsWithRawBody(
+ IReadOnlyList cl1, IReadOnlyList cl2)
+ {
+ return cl1.Where(f => f.Direction == "send").Select(f => (f, Seat: true))
+ .Concat(cl2.Where(f => f.Direction == "send").Select(f => (f, Seat: false)))
+ .OrderBy(x => x.f.Ts)
+ .Select(x => (x.f, x.Seat));
+ }
+
+ private static string Trim(string? s) => (s ?? "").Split(" @ ")[0];
+
+ [Test]
+ public void Full_input_2x2_divergence_table_and_first_remaining_divergence_dump()
+ {
+ // Confirm the brief's per-seat seeds match the captures' Ready frames before relying on them.
+ ConfirmReadySeeds();
+
+ var cells = new[]
+ {
+ Run(setupFrames: false, realSeed: false), // baseline-ish: autonomous Setup hand, seed -1
+ Run(setupFrames: false, realSeed: true),
+ Run(setupFrames: true, realSeed: false),
+ Run(setupFrames: true, realSeed: true), // FULL INPUTS
+ };
+
+ TestContext.WriteLine("=== 2x2 DIVERGENCE TABLE (setup-frames x real-seed) ===");
+ TestContext.WriteLine("setupFrames | realSeed | divergences | selfXor | oppoXor");
+ foreach (var c in cells)
+ TestContext.WriteLine(
+ $" {(c.SetupFrames ? "YES" : "no ")} | {(c.RealSeed ? "YES" : "no ")} | {c.Divergences,2} | {c.SelfXorActive,-5} | {c.OppoXorActive,-5}");
+
+ var full = cells.Single(c => c.SetupFrames && c.RealSeed);
+ TestContext.WriteLine("");
+ TestContext.WriteLine($"FULL-INPUTS cell: setupFrames=YES realSeed=YES -> divergences={full.Divergences} " +
+ $"selfXorActive={full.SelfXorActive} oppoXorActive={full.OppoXorActive}");
+
+ if (full.FirstNotFoundDump is { } d)
+ {
+ TestContext.WriteLine("");
+ TestContext.WriteLine("=== FIRST 'not found in hand' DIVERGENCE (full-inputs cell) ===");
+ TestContext.WriteLine($" seat={d.Seat} uri={d.Uri} wire playIdx={d.PlayIdx} reason={d.Reason}");
+ TestContext.WriteLine($" playIdx in self hand? {d.PlayIdxInSelfHand} in oppo hand? {d.PlayIdxInOppoHand}");
+ TestContext.WriteLine($" engine SELF (seat {d.Seat}) hand [{d.SelfHand.Count}]: " +
+ string.Join(" ", d.SelfHand.Select(h => $"(idx={h.Index},cid={h.CardId})")));
+ TestContext.WriteLine($" engine OPPO hand [{d.OppoHand.Count}]: " +
+ string.Join(" ", d.OppoHand.Select(h => $"(idx={h.Index},cid={h.CardId})")));
+ }
+ else
+ {
+ TestContext.WriteLine("");
+ TestContext.WriteLine("FULL-INPUTS cell produced NO 'not found in hand' divergence.");
+ }
+
+ // EVIDENCE ASSERTIONS (pin the experiment's reproducibility, not a desired fix outcome):
+ Assert.Multiple(() =>
+ {
+ // The seed seam activates BOTH seats' XorShift in every realSeed cell.
+ foreach (var c in cells.Where(c => c.RealSeed))
+ {
+ Assert.That(c.SelfXorActive, Is.True,
+ $"realSeed cell (setup={c.SetupFrames}) must activate self XorShift");
+ Assert.That(c.OppoXorActive, Is.True,
+ $"realSeed cell (setup={c.SetupFrames}) must activate oppo XorShift");
+ }
+ // With NO seed seam AND NO setup frames (the live shadow's effective state — never
+ // ingests the seed-bearing Ready), BOTH seats' XorShift stay inactive.
+ var bare = cells.Single(c => !c.RealSeed && !c.SetupFrames);
+ Assert.That(bare.SelfXorActive, Is.False, "no-seed/no-setup leaves self XorShift inactive");
+ Assert.That(bare.OppoXorActive, Is.False, "no-seed/no-setup leaves oppo XorShift inactive");
+
+ // With setup frames but no seam, the seat-A Ready frame's own idxChangeSeed activates the
+ // SELF XorShift (seat B's Ready NREs before it can seat oppo) — so self is active, oppo isn't.
+ var setupNoSeam = cells.Single(c => !c.RealSeed && c.SetupFrames);
+ Assert.That(setupNoSeam.SelfXorActive, Is.True,
+ "setup-frames cell: seat-A Ready idxChangeSeed activates self XorShift");
+ Assert.That(setupNoSeam.OppoXorActive, Is.False,
+ "setup-frames cell: seat-B Ready NREs before seating oppo XorShift");
+
+ // THE DECISIVE FINDING: full inputs (setup frames + real seed, both seats' XorShift active)
+ // do NOT eliminate the divergences — they stay at the 14 baseline.
+ var full2 = cells.Single(c => c.SetupFrames && c.RealSeed);
+ Assert.That(full2.SelfXorActive && full2.OppoXorActive, Is.True,
+ "full-inputs cell has both seats' XorShift active");
+ Assert.That(full2.Divergences, Is.GreaterThan(0),
+ "REFUTED: full inputs do NOT make the recovery recompute faithful — divergences remain");
+ });
+ }
+
+ // Re-confirm the brief's per-seat seeds against the captured Ready frames (fail loudly if the
+ // fixtures ever drift from the assumed seeds).
+ private static void ConfirmReadySeeds()
+ {
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+ int a = ReadReadySeed(cl1);
+ int b = ReadReadySeed(cl2);
+ TestContext.WriteLine($"Confirmed Ready idxChangeSeed: cl1(seatA)={a} cl2(seatB)={b}");
+ Assert.That(a, Is.EqualTo(SeatASeed), "cl1 Ready idxChangeSeed must equal the brief's seat-A seed");
+ Assert.That(b, Is.EqualTo(SeatBSeed), "cl2 Ready idxChangeSeed must equal the brief's seat-B seed");
+ }
+
+ private static int ReadReadySeed(IReadOnlyList frames)
+ {
+ var ready = frames.First(f => f.Direction == "receive" && f.Uri == nameof(NetworkBattleUri.Ready));
+ var obj = JsonNode.Parse(ready.RawBody)!.AsObject();
+ return (int)obj["idxChangeSeed"]!;
+ }
+ }
+}
diff --git a/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRandomDrawSpinRootCauseTests.cs b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRandomDrawSpinRootCauseTests.cs
new file mode 100644
index 0000000..855518a
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRandomDrawSpinRootCauseTests.cs
@@ -0,0 +1,288 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using NUnit.Framework;
+using SVSim.BattleNode.Protocol;
+using SVSim.BattleNode.Sessions.Engine;
+
+namespace SVSim.BattleEngine.Tests.SessionEngine
+{
+ ///
+ /// PHASE 4 — DRAW-RECOMPUTE ROOT-CAUSE VALIDATION (TEST-ONLY; no production fix; no Engine/*.cs edits).
+ ///
+ /// HYPOTHESIS (from the experiment brief): the shadow diverges ("Target card was not found in hand
+ /// cards", post-mulligan) because the per-turn network DRAW is a SEEDED-RANDOM pick from the deck via
+ /// mgr.StableRandom(...) (SkillRandomSelectFilter.Filtering:49/58), gated by the process-global
+ /// BattleManagerBase.IsRandomDraw — which the real match-load sets true via
+ /// StartOpening → SetupInitialGameState(areCardsRandomlyDrawn:true) (BattleManagerBase.cs:1098/1110).
+ /// The headless .Setup never runs SetupInitialGameState, so IsRandomDraw
+ /// stays FALSE and the shadow draws TOP-OF-DECK while the clients draw seeded-random → mismatch.
+ /// AND the shared _stableRandom stream must be advanced by the wire spin pre-roll the Ready
+ /// frame carries (spin=243), which OperateReceive.StartOperate:80-83 applies but the shadow never
+ /// ingests — so without it the stream is offset.
+ ///
+ /// ISOLATION MATRIX (this is the report's headline): setup frames + real seed are held CONSTANT (the
+ /// faithful baseline the prior FullInput experiment pinned at 14); the two NEW variables are toggled:
+ /// • {IsRandomDraw=false, no spin} = baseline (top-of-deck draws; the live shadow's effective state)
+ /// • {IsRandomDraw=true, no spin} = random-draw active but stream MIS-aligned (expect WORSE)
+ /// • {IsRandomDraw=true, +spin} = random-draw active AND stream aligned (the hypothesised fix)
+ ///
+ /// SPIN APPLICATION: spin=243 appears on the Ready frame in BOTH captures (each client applies its own
+ /// once). Our shadow shares ONE _stableRandom across both seats (seated as both players), and a
+ /// single client's stream sits 243 draws in after ITS Ready — so we apply spin=243 ONCE, after the
+ /// Deal/Swap/Ready setup frames and before the plays, exactly where the real client's StartOperate would.
+ /// (A scan of both fixtures confirms Ready is the ONLY frame carrying a non-zero spin.)
+ ///
+ [TestFixture]
+ [NonParallelizable]
+ public class CaptureReplayRandomDrawSpinRootCauseTests
+ {
+ private const int SeatASeed = 1430655717; // cl1 / seat A / player (Ready idxChangeSeed)
+ private const int SeatBSeed = 661650374; // cl2 / seat B / opponent
+ private const int WireSpin = 243; // both captures' Ready frame spin
+
+ private static readonly HashSet SkipUris = new()
+ {
+ nameof(NetworkBattleUri.Echo),
+ nameof(NetworkBattleUri.ChatStamp),
+ nameof(NetworkBattleUri.Gungnir),
+ };
+
+ private sealed record HandDump(string Seat, int PlayIdx, string Uri, string Reason,
+ int StableRandomCount,
+ IReadOnlyList<(int Index, int CardId)> SelfHand,
+ IReadOnlyList<(int Index, int CardId)> OppoHand,
+ bool PlayIdxInSelfHand, bool PlayIdxInOppoHand);
+
+ private sealed record Cell(bool RandomDraw, bool Spin, int Divergences, HandDump? FirstNotFound);
+
+ private static int ReadPlayIdx(string rawBody)
+ {
+ using var doc = JsonDocument.Parse(rawBody);
+ return doc.RootElement.TryGetProperty("playIdx", out var p) && p.TryGetInt32(out var v) ? v : -1;
+ }
+
+ private static List<(int, int)> HandSnapshot(SessionBattleEngine engine, bool seat)
+ {
+ var list = new List<(int, int)>();
+ int n = engine.HandCount(seat);
+ for (int i = 0; i < n; i++)
+ list.Add((engine.HandCardIndex(seat, i), engine.HandCardId(seat, i)));
+ return list;
+ }
+
+ private static CapturedFrame Receive(IReadOnlyList frames, string uri) =>
+ frames.First(f => f.Direction == "receive" && f.Uri == uri);
+
+ private static Cell Run(bool randomDraw, bool spin)
+ {
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+
+ var deckA = CaptureReplay.SelfDeckFrom(cl1);
+ var deckB = CaptureReplay.SelfDeckFrom(cl2);
+ Assert.That(deckA, Is.Not.Empty);
+ Assert.That(deckB, Is.Not.Empty);
+
+ var engine = new SessionBattleEngine();
+ engine.Setup(masterSeed: CaptureReplay.SeedFrom(cl1), seatADeck: deckA, seatBDeck: deckB);
+ Assert.That(engine.IsReady, Is.True);
+
+ // CONSTANT across all cells: faithful seed seam (both seats' XorShift active), sidestepping the
+ // seat-B Ready NRE — identical to the FullInput experiment's full-inputs cell.
+ engine.DebugSeedIdxChange(SeatASeed, SeatBSeed);
+
+ // NEW VARIABLE 1: the IsRandomDraw gate. Set BEFORE any draw (deal is the first draw).
+ engine.DebugSetRandomDraw(randomDraw);
+
+ int divergences = 0;
+ HandDump? firstNotFound = null;
+
+ void Ingest(MsgEnvelope env, bool seat, string uri, string rawBody)
+ {
+ var r = engine.Receive(env, isPlayerSeat: seat);
+ if (!r.Diverged) return;
+ divergences++;
+ if (firstNotFound is null && (r.RejectReason ?? "").Contains("not found in hand"))
+ {
+ var self = HandSnapshot(engine, seat);
+ var oppo = HandSnapshot(engine, !seat);
+ int playIdx = ReadPlayIdx(rawBody);
+ firstNotFound = new HandDump(
+ seat ? "A" : "B", playIdx, uri, Trim(r.RejectReason),
+ engine.DebugStableRandomCount, self, oppo,
+ self.Any(h => h.Item1 == playIdx), oppo.Any(h => h.Item1 == playIdx));
+ }
+ }
+
+ // --- Phase 1: setup frames (CONSTANT: Deal once + each seat's Swap + Ready) -------------------
+ var deal = Receive(cl1, nameof(NetworkBattleUri.Deal));
+ Ingest(deal.Env, seat: true, nameof(NetworkBattleUri.Deal), deal.RawBody);
+ foreach (var (frames, seat) in new[] { (cl1, true), (cl2, false) })
+ {
+ var swap = Receive(frames, nameof(NetworkBattleUri.Swap));
+ Ingest(swap.Env, seat, nameof(NetworkBattleUri.Swap), swap.RawBody);
+ var ready = Receive(frames, nameof(NetworkBattleUri.Ready));
+ Ingest(ready.Env, seat, nameof(NetworkBattleUri.Ready), ready.RawBody);
+ }
+
+ // NEW VARIABLE 2: the spin pre-roll, applied at mulligan-end (after Ready, before the first
+ // turn-start draw) — where OperateReceive.StartOperate applies the Ready's spin in production.
+ // ONE application of 243 (shared stream, one client's worth of advance).
+ if (spin)
+ engine.DebugSpinPreroll(WireSpin);
+
+ // --- Phase 2: replay both clients' interleaved SENDS (the plays) ------------------------------
+ var sends = SendsWithRawBody(cl1, cl2)
+ .Where(x => !SkipUris.Contains(x.Frame.Uri))
+ .ToList();
+ foreach (var x in sends)
+ Ingest(x.Frame.Env, x.Seat, x.Frame.Uri, x.Frame.RawBody);
+
+ return new Cell(randomDraw, spin, divergences, firstNotFound);
+ }
+
+ private static IEnumerable<(CapturedFrame Frame, bool Seat)> SendsWithRawBody(
+ IReadOnlyList cl1, IReadOnlyList cl2)
+ {
+ return cl1.Where(f => f.Direction == "send").Select(f => (f, Seat: true))
+ .Concat(cl2.Where(f => f.Direction == "send").Select(f => (f, Seat: false)))
+ .OrderBy(x => x.f.Ts)
+ .Select(x => (x.f, x.Seat));
+ }
+
+ private static string Trim(string? s) => (s ?? "").Split(" @ ")[0];
+
+ [Test]
+ public void IsRandomDraw_plus_spin_preroll_isolation_matrix()
+ {
+ try
+ {
+ ConfirmSpin();
+
+ var baseline = Run(randomDraw: false, spin: false);
+ var rdOnly = Run(randomDraw: true, spin: false);
+ var rdSpin = Run(randomDraw: true, spin: true);
+
+ TestContext.WriteLine("=== ISOLATION MATRIX (setup-frames + real-seed held CONSTANT) ===");
+ TestContext.WriteLine("IsRandomDraw | spin | divergences");
+ TestContext.WriteLine($" false | no | {baseline.Divergences}");
+ TestContext.WriteLine($" true | no | {rdOnly.Divergences}");
+ TestContext.WriteLine($" true | +243 | {rdSpin.Divergences}");
+
+ DumpFirst("baseline {false,no}", baseline);
+ DumpFirst("rd-only {true,no}", rdOnly);
+ DumpFirst("rd+spin {true,+243}", rdSpin);
+
+ Assert.Pass(
+ $"MATRIX baseline={baseline.Divergences} rdOnly={rdOnly.Divergences} rdSpin={rdSpin.Divergences}");
+ }
+ catch (SuccessException) { throw; }
+ catch (Exception ex)
+ {
+ TestContext.WriteLine("EXPERIMENT THREW: " + ex);
+ throw;
+ }
+ }
+
+ private static void DumpFirst(string label, Cell c)
+ {
+ if (c.FirstNotFound is not { } d)
+ {
+ TestContext.WriteLine($"[{label}] no 'not found in hand' divergence.");
+ return;
+ }
+ TestContext.WriteLine($"[{label}] FIRST 'not found in hand': seat={d.Seat} uri={d.Uri} " +
+ $"wire playIdx={d.PlayIdx} stableRandomCount={d.StableRandomCount} reason={d.Reason}");
+ TestContext.WriteLine($" playIdx in self hand? {d.PlayIdxInSelfHand} in oppo hand? {d.PlayIdxInOppoHand}");
+ TestContext.WriteLine($" SELF (seat {d.Seat}) hand [{d.SelfHand.Count}]: " +
+ string.Join(" ", d.SelfHand.Select(h => $"(idx={h.Index},cid={h.CardId})")));
+ TestContext.WriteLine($" OPPO hand [{d.OppoHand.Count}]: " +
+ string.Join(" ", d.OppoHand.Select(h => $"(idx={h.Index},cid={h.CardId})")));
+ }
+
+ /// STEP 4 (payoff check): with the hypothesised fix applied {IsRandomDraw=true, +spin},
+ /// does the engine reach and RESOLVE cl1's spellboost play so PlayedCardSpellboost/PlayedCardCost
+ /// return real (non-zero) values? cl1's deck carries the spellboost-scaling follower 101314020 at
+ /// deck idx 10/21/25. We replay the {true,+243} cell and, after each accepted seat-A PlayActions,
+ /// probe whether any in-play/cemetery card has that id with a resolved cost/spellboost. We report
+ /// whether the spellboost play was ever reached at all.
+ [Test]
+ public void Spellboost_play_resolution_under_random_draw_plus_spin()
+ {
+ const int SpellboostCardId = 101314020;
+
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+ var deckA = CaptureReplay.SelfDeckFrom(cl1);
+ var deckB = CaptureReplay.SelfDeckFrom(cl2);
+
+ var engine = new SessionBattleEngine();
+ engine.Setup(masterSeed: CaptureReplay.SeedFrom(cl1), seatADeck: deckA, seatBDeck: deckB);
+ engine.DebugSeedIdxChange(SeatASeed, SeatBSeed);
+ engine.DebugSetRandomDraw(true);
+
+ // setup frames
+ engine.Receive(Receive(cl1, nameof(NetworkBattleUri.Deal)).Env, isPlayerSeat: true);
+ foreach (var (frames, seat) in new[] { (cl1, true), (cl2, false) })
+ {
+ engine.Receive(Receive(frames, nameof(NetworkBattleUri.Swap)).Env, isPlayerSeat: seat);
+ engine.Receive(Receive(frames, nameof(NetworkBattleUri.Ready)).Env, isPlayerSeat: seat);
+ }
+ engine.DebugSpinPreroll(WireSpin);
+
+ int acceptedSeatAPlays = 0, divergedBeforeFirstPlay = 0;
+ bool spellboostResolved = false;
+ int sbCost = -999, sbCharge = -999;
+
+ var sends = SendsWithRawBody(cl1, cl2).Where(x => !SkipUris.Contains(x.Frame.Uri)).ToList();
+ bool sawFirstPlay = false;
+ foreach (var x in sends)
+ {
+ bool isPlay = x.Frame.Uri == nameof(NetworkBattleUri.PlayActions);
+ var r = engine.Receive(x.Frame.Env, isPlayerSeat: x.Seat);
+ if (isPlay && !sawFirstPlay) { sawFirstPlay = true; if (r.Diverged) divergedBeforeFirstPlay++; }
+ if (isPlay && x.Seat && !r.Diverged)
+ {
+ acceptedSeatAPlays++;
+ int playIdx = ReadPlayIdx(x.Frame.RawBody);
+ long id = engine.PlayedCardId(true, playIdx, 0);
+ if (id == SpellboostCardId)
+ {
+ spellboostResolved = true;
+ sbCost = engine.PlayedCardCost(true, playIdx, -1);
+ sbCharge = engine.PlayedCardSpellboost(true, playIdx, -1);
+ break;
+ }
+ }
+ }
+
+ TestContext.WriteLine($"[spellboost payoff] acceptedSeatAPlays={acceptedSeatAPlays} " +
+ $"divergedAtFirstPlay={divergedBeforeFirstPlay} spellboostResolved={spellboostResolved} " +
+ $"cost={sbCost} charge={sbCharge}");
+
+ // The replay diverges at the FIRST seat-A play (matrix shows playIdx=8 not in hand), so the
+ // engine never advances to the later spellboost play — the visible spellboost symptom is NOT
+ // fixed by {IsRandomDraw+spin} because the prerequisite (aligned draws) is not met.
+ Assert.That(divergedBeforeFirstPlay, Is.EqualTo(1),
+ "the FIRST seat-A play already diverges under {IsRandomDraw=true,+spin}");
+ Assert.That(spellboostResolved, Is.False,
+ "the spellboost play is never reached because the replay diverges at the first play");
+ }
+
+ private static void ConfirmSpin()
+ {
+ foreach (var fn in new[] { "battle_test_fresh_cl1.ndjson", "battle_test_fresh_cl2.ndjson" })
+ {
+ var frames = CaptureReplay.Load(fn);
+ var ready = Receive(frames, nameof(NetworkBattleUri.Ready));
+ var obj = JsonNode.Parse(ready.RawBody)!.AsObject();
+ int spin = obj.TryGetPropertyValue("spin", out var s) ? (int)s! : 0;
+ TestContext.WriteLine($"Confirmed {fn} Ready spin={spin}");
+ Assert.That(spin, Is.EqualTo(WireSpin), $"{fn} Ready spin must equal {WireSpin}");
+ }
+ }
+ }
+}
diff --git a/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayReshuffleRootCauseTests.cs b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayReshuffleRootCauseTests.cs
new file mode 100644
index 0000000..f5bde5c
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayReshuffleRootCauseTests.cs
@@ -0,0 +1,182 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json.Nodes;
+using NUnit.Framework;
+using SVSim.BattleNode.Protocol;
+using SVSim.BattleNode.Sessions.Engine;
+
+namespace SVSim.BattleEngine.Tests.SessionEngine
+{
+ ///
+ /// PHASE 4 STEP 1 — Tier 2 capture-replay root-cause VERIFICATION (NOT a fix).
+ ///
+ /// Replays the FRESH smoke captures (battle 907324319325) — battle_test_fresh_cl1/cl2.ndjson —
+ /// through a , then measures whether the per-seat idxChangeSeed
+ /// the real Ready frame carries is what controls the "Target card was not found in hand cards"
+ /// divergence symptom.
+ ///
+ /// FAITHFUL SETUP (the live ShadowIngest only feeds client SENDS, which contain NO Deal/Ready, so a
+ /// bare send-only replay can't even seat a hand — that conflates "missing Deal" with "missing
+ /// reshuffle"). To ISOLATE the reshuffle/seed effect we seat each seat's hand from its OWN client's
+ /// RECEIVE Deal + Swap + Ready (the frames that establish the hand and reach mulligan-end), then replay
+ /// both clients' interleaved SENDS (the plays). The Ready frame natively carries the real per-seat
+ /// idxChangeSeed (cl1=1430655717, cl2=661650374), and the engine's recovery receiver calls
+ /// CreateXorShift from it (NetworkBattleReceiver.cs:1125-1126). The A/B is then:
+ /// • WITH-SEED: ingest the Ready frame verbatim (idxChangeSeed present) -> XorShift active;
+ /// • SEED-STRIPPED: ingest the SAME Ready frame with idxChangeSeed forced to -1 -> XorShift inactive
+ /// (this is exactly the live shadow's effective state, since it never ingests the seed-bearing Ready).
+ /// The ONLY difference between the two runs is whether the seed reaches CreateXorShift.
+ ///
+ /// DECK SETUP MECHANISM (feasibility crux, RESOLVED): each side's deck is reconstructed from the
+ /// capture's Matched.selfDeck (idx->cardId, the exact shuffled order the node also handed the
+ /// client) via ; the master seed from Matched.selfInfo.seed.
+ /// The deck IS in the socket capture — no external fixture needed.
+ ///
+ [TestFixture]
+ [NonParallelizable]
+ public class CaptureReplayReshuffleRootCauseTests
+ {
+ private static readonly HashSet SkipUris = new()
+ {
+ nameof(NetworkBattleUri.Echo),
+ nameof(NetworkBattleUri.ChatStamp),
+ nameof(NetworkBattleUri.Gungnir),
+ };
+
+ private static readonly HashSet MulliganUris = new()
+ {
+ nameof(NetworkBattleUri.Deal),
+ nameof(NetworkBattleUri.Swap),
+ nameof(NetworkBattleUri.Ready),
+ };
+
+ private sealed record ReplayOutcome(
+ int FrameCount, List Divergences, bool AllDivergencesPostMulligan, bool SelfXorShiftActive);
+
+ // Re-parse a captured frame, overriding the Ready body's idxChangeSeed (and oppoIdxChangeSeed if
+ // present). Used to STRIP the seed (-1) to model the live shadow's seed-less state.
+ private static MsgEnvelope OverrideReadySeed(CapturedFrame f, int newSeed)
+ {
+ var obj = JsonNode.Parse(f.RawBody)!.AsObject();
+ obj["idxChangeSeed"] = newSeed;
+ if (obj.ContainsKey("oppoIdxChangeSeed")) obj["oppoIdxChangeSeed"] = newSeed;
+ return MsgEnvelope.FromJson(obj.ToJsonString());
+ }
+
+ /// Seat both hands from each client's receive Deal+Swap+Ready, then replay both clients'
+ /// interleaved SENDS. forces the Ready idxChangeSeed to -1 (the live
+ /// shadow's effective state). Returns divergences + the post-setup self XorShift state.
+ private static ReplayOutcome Replay(bool stripSeed)
+ {
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+
+ var deckA = CaptureReplay.SelfDeckFrom(cl1);
+ var deckB = CaptureReplay.SelfDeckFrom(cl2);
+ Assert.That(deckA, Is.Not.Empty, "cl1 Matched.selfDeck must reconstruct seat A's deck");
+ Assert.That(deckB, Is.Not.Empty, "cl2 Matched.selfDeck must reconstruct seat B's deck");
+
+ var engine = new SessionBattleEngine();
+ engine.Setup(masterSeed: CaptureReplay.SeedFrom(cl1), seatADeck: deckA, seatBDeck: deckB);
+ Assert.That(engine.IsReady, Is.True, "engine must seat from the captured decks + seed");
+
+ var divergences = new List();
+ bool sawMulliganEnd = false;
+ bool anyDivergencePreMulligan = false;
+
+ void Ingest(MsgEnvelope env, bool seat, string uri)
+ {
+ if (MulliganUris.Contains(uri)) sawMulliganEnd = true;
+ var r = engine.Receive(env, isPlayerSeat: seat);
+ if (r.Diverged)
+ {
+ divergences.Add($"seat={(seat ? "A" : "B")} {uri}: {Trim(r.RejectReason)}");
+ if (!sawMulliganEnd) anyDivergencePreMulligan = true;
+ }
+ }
+
+ // --- Phase 1: seat both hands from the receive setup frames ----------------------------------
+ // A single Deal seats BOTH opening hands (cl1's receive Deal carries self=A + oppo=B), so we
+ // ingest Deal ONCE (as seat A) — ingesting both clients' Deals would double-deal (NRE / "Sequence
+ // contains more than one"). Each seat's Swap then applies that seat's mulligan, and each seat's
+ // Ready carries THAT seat's idxChangeSeed (cl1's for A, cl2's for B; the recovery receiver consumes
+ // only the SELF seed per ingest, NetworkBattleReceiver.cs:1126), reaching mulligan-end per seat.
+ CapturedFrame Receive(IReadOnlyList frames, string uri) =>
+ frames.First(f => f.Direction == "receive" && f.Uri == uri);
+
+ // Deal once (seat A's receive Deal seats both hands).
+ Ingest(Receive(cl1, nameof(NetworkBattleUri.Deal)).Env, seat: true, nameof(NetworkBattleUri.Deal));
+ // Each seat's mulligan swap, then each seat's Ready (its own seed).
+ foreach (var (frames, seat) in new[] { (cl1, true), (cl2, false) })
+ {
+ Ingest(Receive(frames, nameof(NetworkBattleUri.Swap)).Env, seat, nameof(NetworkBattleUri.Swap));
+ var ready = Receive(frames, nameof(NetworkBattleUri.Ready));
+ var readyEnv = stripSeed ? OverrideReadySeed(ready, -1) : ready.Env;
+ Ingest(readyEnv, seat, nameof(NetworkBattleUri.Ready));
+ }
+
+ bool selfActive = engine.SelfXorShiftActive;
+
+ // --- Phase 2: replay both clients' interleaved SENDS (the plays / turn ops) -------------------
+ var sends = CaptureReplay.InterleavedSends(cl1, cl2)
+ .Where(x => !SkipUris.Contains(x.Env.Uri.ToString()))
+ .ToList();
+ foreach (var (env, seat) in sends)
+ Ingest(env, seat, env.Uri.ToString());
+
+ return new ReplayOutcome(
+ FrameCount: sends.Count, divergences, !anyDivergencePreMulligan, selfActive);
+ }
+
+ private static string Trim(string? s) =>
+ (s ?? "").Split(" @ ")[0];
+
+ [Test]
+ public void Capture_replay_reproduces_post_mulligan_divergence_and_pins_what_the_seed_does_not_fix()
+ {
+ var withSeed = Replay(stripSeed: false);
+ var stripped = Replay(stripSeed: true);
+
+ TestContext.WriteLine($"WITH-SEED (Ready idxChangeSeed present): selfXorShiftActive={withSeed.SelfXorShiftActive} " +
+ $"playFrames={withSeed.FrameCount} divergences={withSeed.Divergences.Count}");
+ foreach (var d in withSeed.Divergences) TestContext.WriteLine(" DIVERGE " + d);
+ TestContext.WriteLine($"SEED-STRIPPED (idxChangeSeed=-1, the live shadow state): selfXorShiftActive={stripped.SelfXorShiftActive} " +
+ $"playFrames={stripped.FrameCount} divergences={stripped.Divergences.Count}");
+ foreach (var d in stripped.Divergences) TestContext.WriteLine(" DIVERGE " + d);
+
+ Assert.Multiple(() =>
+ {
+ // (1) The reported symptom reproduces DETERMINISTICALLY from the captures: the replay diverges,
+ // including the verbatim "Target card was not found in hand cards" exception.
+ Assert.That(withSeed.Divergences, Is.Not.Empty,
+ "the capture replay must reproduce the divergence symptom");
+ Assert.That(withSeed.Divergences.Any(d => d.Contains("not found in hand")), Is.True,
+ "the reported 'Target card was not found in hand cards' symptom must reproduce");
+
+ // (2) All divergences occur AFTER the mulligan barrier — consistent with a post-mulligan cause.
+ Assert.That(withSeed.AllDivergencesPostMulligan, Is.True, "with-seed divergences are post-mulligan");
+ Assert.That(stripped.AllDivergencesPostMulligan, Is.True, "stripped divergences are post-mulligan");
+
+ // (3) The wire seed DOES drive the engine's XorShift gate (NetworkBattleReceiver.cs:1126):
+ // present -> active, stripped (the live shadow's state) -> inactive.
+ Assert.That(withSeed.SelfXorShiftActive, Is.True,
+ "ingesting the real Ready (idxChangeSeed present) activates the engine's XorShift");
+ Assert.That(stripped.SelfXorShiftActive, Is.False,
+ "stripping idxChangeSeed (the live shadow's state) leaves the XorShift inactive");
+
+ // (4) THE KEY VERIFICATION FINDING — activating the XorShift via the wire seed does NOT, on its
+ // own, change the divergence count. The engine's recovery/watch RECEIVE path never performs
+ // the post-mulligan full-deck reshuffle the live client does: the XorShift's GetChangeInt is
+ // consumed ONLY by AddToDeckCardIndexChange (BattlePlayerBase.cs:3079) for cards added to the
+ // deck AFTER mulligan-end, and the per-turn draw is engine-computed off the (un-reshuffled)
+ // deck order, not driven by the wire's `move idx`. So "feed the seed" alone does NOT fix the
+ // desync headless — the eventual fix must also make the engine reshuffle the deck post-
+ // mulligan to match the client (or drive the draw from the wire idx). We PIN this here.
+ Assert.That(stripped.Divergences.Count, Is.EqualTo(withSeed.Divergences.Count),
+ "VERIFIED: activating the XorShift via the wire seed alone does NOT change the divergence " +
+ "count — the engine's receive path does not reshuffle the deck, so the seed is necessary " +
+ "but NOT sufficient (the fix needs the reshuffle too, not just the seed)");
+ });
+ }
+ }
+}
diff --git a/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRngSeatAttributionProbeTests.cs b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRngSeatAttributionProbeTests.cs
new file mode 100644
index 0000000..22ddb24
--- /dev/null
+++ b/SVSim.BattleEngine.Tests/SessionEngine/CaptureReplayRngSeatAttributionProbeTests.cs
@@ -0,0 +1,215 @@
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using SVSim.BattleNode.Protocol;
+using SVSim.BattleNode.Sessions.Engine;
+
+namespace SVSim.BattleEngine.Tests.SessionEngine
+{
+ ///
+ /// PHASE 4 — OPTION-A VIABILITY PROBE (TEST-ONLY; no production fix; no Engine/*.cs edits).
+ ///
+ /// QUESTION: can a per-seat RNG router in the headless engine reliably attribute each StableRandom roll
+ /// to the correct seat — so two seats can draw from two independent same-seeded sub-streams (mirroring
+ /// two real clients, each with its OWN _stableRandom)?
+ ///
+ /// METHOD: replay battle_test_fresh_cl1/cl2 through a whose mgr RNG is
+ /// a logging source. On EVERY roll it records (a) the seat signals the mgr can read from its own state
+ /// (GetBattlePlayer(true/false).IsSelfTurn — the richest seat signal a mgr-level StableRandom override
+ /// sees; there is NO "current operating seat" field on the mgr), and (b) the live call stack (where the
+ /// acting seat is actually visible: MulliganCtrl._battlePlayer / BattlePlayerBase.LotteryRandomDrawCard /
+ /// OperateReceive.StartOperate spin pre-roll). We dump the rolls for the mulligan lotteries, the first
+ /// turn draws, and the spin pre-roll, and classify each — reporting whether the seat is UNAMBIGUOUS from
+ /// mgr STATE vs only from the STACK.
+ ///
+ [TestFixture]
+ [NonParallelizable]
+ public class CaptureReplayRngSeatAttributionProbeTests
+ {
+ private const int SeatASeed = 1430655717; // cl1 Ready idxChangeSeed
+ private const int SeatBSeed = 661650374; // cl2 Ready idxChangeSeed
+ private const int WireSpin = 243;
+
+ private static readonly HashSet SkipUris = new()
+ {
+ nameof(NetworkBattleUri.Echo),
+ nameof(NetworkBattleUri.ChatStamp),
+ nameof(NetworkBattleUri.Gungnir),
+ };
+
+ private static CapturedFrame Receive(IReadOnlyList frames, string uri) =>
+ frames.First(f => f.Direction == "receive" && f.Uri == uri);
+
+ private static IEnumerable<(CapturedFrame Frame, bool Seat)> SendsInTsOrder(
+ IReadOnlyList cl1, IReadOnlyList cl2) =>
+ cl1.Where(f => f.Direction == "send").Select(f => (f, Seat: true))
+ .Concat(cl2.Where(f => f.Direction == "send").Select(f => (f, Seat: false)))
+ .OrderBy(x => x.f.Ts)
+ .Select(x => (x.f, x.Seat));
+
+ [Test]
+ public void Roll_log_reveals_whether_acting_seat_is_attributable_from_state_or_only_stack()
+ {
+ var cl1 = CaptureReplay.Load("battle_test_fresh_cl1.ndjson");
+ var cl2 = CaptureReplay.Load("battle_test_fresh_cl2.ndjson");
+
+ var deckA = CaptureReplay.SelfDeckFrom(cl1);
+ var deckB = CaptureReplay.SelfDeckFrom(cl2);
+
+ // (5) seeds
+ int seedA = CaptureReplay.SeedFrom(cl1);
+ int seedB = CaptureReplay.SeedFrom(cl2);
+ TestContext.WriteLine($"=== SEEDS (Matched.selfInfo.seed) ===");
+ TestContext.WriteLine($" cl1 seed = {seedA}");
+ TestContext.WriteLine($" cl2 seed = {seedB}");
+ TestContext.WriteLine($" SAME? {seedA == seedB} (Ready idxChangeSeed cl1={SeatASeed} cl2={SeatBSeed} — DIFFERENT)");
+ TestContext.WriteLine("");
+
+ var engine = new SessionBattleEngine();
+ var log = engine.DebugSetupWithRollLog(masterSeed: seedA, seatADeck: deckA, seatBDeck: deckB);
+ Assert.That(engine.IsReady, Is.True);
+
+ engine.DebugSeedIdxChange(SeatASeed, SeatBSeed);
+ engine.DebugSetRandomDraw(true); // the gate that makes draws actually ROLL
+
+ // mark roll-log boundaries so we can bucket the rolls by phase
+ int Mark() => log.Count;
+
+ int beforeDeal = Mark();
+ engine.Receive(Receive(cl1, nameof(NetworkBattleUri.Deal)).Env, isPlayerSeat: true);
+ int afterDeal = Mark();
+
+ // seat A mulligan (Swap+Ready) then seat B mulligan
+ engine.Receive(Receive(cl1, nameof(NetworkBattleUri.Swap)).Env, isPlayerSeat: true);
+ int afterSwapA = Mark();
+ engine.Receive(Receive(cl1, nameof(NetworkBattleUri.Ready)).Env, isPlayerSeat: true);
+ int afterReadyA = Mark();
+ engine.Receive(Receive(cl2, nameof(NetworkBattleUri.Swap)).Env, isPlayerSeat: false);
+ int afterSwapB = Mark();
+ engine.Receive(Receive(cl2, nameof(NetworkBattleUri.Ready)).Env, isPlayerSeat: false);
+ int afterReadyB = Mark();
+
+ // spin pre-roll (one client's 243 advance, applied once on the shared stream)
+ engine.DebugSpinPreroll(WireSpin);
+ int afterSpin = Mark();
+
+ // replay both clients' interleaved sends (the plays + turn ops -> turn-start draws fire here)
+ var sends = SendsInTsOrder(cl1, cl2).Where(x => !SkipUris.Contains(x.Frame.Uri)).ToList();
+ foreach (var x in sends)
+ engine.Receive(x.Frame.Env, isPlayerSeat: x.Seat);
+ int afterSends = Mark();
+
+ TestContext.WriteLine("=== ROLL-COUNT BY PHASE (IsRandomDraw=true) ===");
+ TestContext.WriteLine($" Deal : {afterDeal - beforeDeal}");
+ TestContext.WriteLine($" Swap A : {afterSwapA - afterDeal}");
+ TestContext.WriteLine($" Ready A (mulligan): {afterReadyA - afterSwapA}");
+ TestContext.WriteLine($" Swap B : {afterSwapB - afterReadyA}");
+ TestContext.WriteLine($" Ready B (mulligan): {afterReadyB - afterSwapB}");
+ TestContext.WriteLine($" spin pre-roll : {afterSpin - afterReadyB} (expected {WireSpin})");
+ TestContext.WriteLine($" all sends/plays : {afterSends - afterSpin}");
+ TestContext.WriteLine($" TOTAL : {log.Count}");
+ TestContext.WriteLine("");
+
+ DumpRange("DEAL", log, beforeDeal, afterDeal);
+ DumpRange("SWAP A (mulligan lottery, seat A)", log, afterDeal, afterSwapA);
+ DumpRange("READY A (mulligan, seat A)", log, afterSwapA, afterReadyA);
+ DumpRange("SWAP B (mulligan lottery, seat B)", log, afterReadyA, afterSwapB);
+ DumpRange("READY B (mulligan, seat B)", log, afterSwapB, afterReadyB);
+ DumpSpinSummary("SPIN PRE-ROLL", log, afterReadyB, afterSpin);
+ // first ~12 of the play phase covers the early turn-start draws for both seats
+ DumpRange("FIRST PLAY-PHASE ROLLS (turn draws + effects)", log, afterSpin,
+ System.Math.Min(afterSpin + 12, afterSends));
+
+ // === STATE-vs-STACK attribution analysis ===
+ AnalyzeAttribution(log, afterSpin);
+
+ Assert.Pass($"probe complete: {log.Count} rolls logged; see TestContext output for attribution analysis");
+ }
+
+ private static void DumpRange(string label, IReadOnlyList log, int from, int to)
+ {
+ TestContext.WriteLine($"--- {label} [rolls {from}..{to - 1}] ({to - from} rolls) ---");
+ for (int i = from; i < to; i++)
+ {
+ var e = log[i];
+ TestContext.WriteLine($" #{e.Index} {e.Api}(arg={e.Arg}) | mgrState: self.IsSelfTurn={e.SelfIsSelfTurn} oppo.IsSelfTurn={e.OppoIsSelfTurn} | classify={Classify(e)}");
+ TestContext.WriteLine($" stack: {e.Stack}");
+ }
+ if (to - from == 0) TestContext.WriteLine(" (none)");
+ TestContext.WriteLine("");
+ }
+
+ private static void DumpSpinSummary(string label, IReadOnlyList log, int from, int to)
+ {
+ TestContext.WriteLine($"--- {label} [rolls {from}..{to - 1}] ({to - from} rolls) ---");
+ if (to - from > 0)
+ {
+ var first = log[from];
+ TestContext.WriteLine($" first spin roll #{first.Index}: self.IsSelfTurn={first.SelfIsSelfTurn} oppo.IsSelfTurn={first.OppoIsSelfTurn}");
+ TestContext.WriteLine($" stack: {first.Stack}");
+ bool allStateIdentical = log.Skip(from).Take(to - from)
+ .All(e => e.SelfIsSelfTurn == first.SelfIsSelfTurn && e.OppoIsSelfTurn == first.OppoIsSelfTurn);
+ bool allViaStartOperate = log.Skip(from).Take(to - from).All(e => e.Stack.Contains("StartOperate"));
+ TestContext.WriteLine($" all {to - from} spin rolls have identical mgr seat-state? {allStateIdentical}");
+ TestContext.WriteLine($" all {to - from} spin rolls routed via OperateReceive.StartOperate? {allViaStartOperate}");
+ }
+ TestContext.WriteLine("");
+ }
+
+ // Best-effort classification from the STACK (the ground truth of who is rolling).
+ private static string Classify(SessionBattleEngine.RollEntry e)
+ {
+ string s = e.Stack;
+ if (s.Contains("StartOperate")) return "SPIN-PREROLL";
+ if (s.Contains("_LotMulliganCardIndex") || s.Contains("MulliganCtrl")) return "MULLIGAN-LOTTERY";
+ if (s.Contains("LotteryRandomDrawCard") || s.Contains("RandomCardDraw")) return "TURN/EFFECT-DRAW";
+ if (s.Contains("SkillRandomSelectFilter")) return "SKILL-FILTER-DRAW";
+ return "OTHER-EFFECT";
+ }
+
+ private static void AnalyzeAttribution(IReadOnlyList log, int playPhaseStart)
+ {
+ TestContext.WriteLine("=== STATE-vs-STACK ATTRIBUTION ANALYSIS ===");
+
+ // 1) Does mgr-state (IsSelfTurn flags) ever change across the whole replay? If both flags are
+ // pinned at setup values (self=true/oppo=false) the entire time, mgr-state CANNOT distinguish
+ // seats — every roll looks identical from mgr state.
+ var distinctStates = log
+ .Select(e => (e.SelfIsSelfTurn, e.OppoIsSelfTurn))
+ .Distinct()
+ .ToList();
+ TestContext.WriteLine($" distinct mgr seat-states observed across ALL {log.Count} rolls: {distinctStates.Count}");
+ foreach (var st in distinctStates)
+ TestContext.WriteLine($" (self.IsSelfTurn={st.Item1}, oppo.IsSelfTurn={st.Item2})");
+
+ // 2) For the mulligan lotteries: seat A's 6 rolls then seat B's 6 rolls happen back-to-back. Are
+ // their mgr-states distinguishable? (They should NOT be — IsSelfTurn isn't toggled during
+ // mulligan; both lotteries run with the same setup-time flags.)
+ var mulliganRolls = log.Where(e => Classify(e) == "MULLIGAN-LOTTERY").ToList();
+ var mulliganStates = mulliganRolls.Select(e => (e.SelfIsSelfTurn, e.OppoIsSelfTurn)).Distinct().Count();
+ TestContext.WriteLine($" mulligan-lottery rolls: {mulliganRolls.Count}; distinct mgr seat-states among them: {mulliganStates}");
+ TestContext.WriteLine($" -> seat attributable from mgr STATE alone? {(mulliganStates >= 2 ? "MAYBE" : "NO (state identical for both seats' lotteries)")}");
+ bool mulliganSeatInStack = mulliganRolls.All(e => e.Stack.Contains("Mulligan") || e.Stack.Contains("_LotMulligan"));
+ TestContext.WriteLine($" -> mulligan rolls carry a MulliganCtrl frame on the stack? {mulliganSeatInStack}");
+
+ // 3) For the play-phase draws: are turn-start draws present at all, and do their mgr-states track
+ // the acting seat (i.e. does IsSelfTurn flip to identify whose turn/draw it is)?
+ var drawRolls = log.Skip(playPhaseStart)
+ .Where(e => Classify(e) is "TURN/EFFECT-DRAW" or "SKILL-FILTER-DRAW")
+ .ToList();
+ TestContext.WriteLine($" play-phase draw/filter rolls: {drawRolls.Count}");
+ if (drawRolls.Count > 0)
+ {
+ var drawStates = drawRolls.Select(e => (e.SelfIsSelfTurn, e.OppoIsSelfTurn)).Distinct().Count();
+ TestContext.WriteLine($" distinct mgr seat-states among draw rolls: {drawStates}");
+ }
+
+ TestContext.WriteLine("");
+ TestContext.WriteLine(" INTERPRETATION:");
+ TestContext.WriteLine(" * If distinct mgr seat-states == 1 for a phase, the StableRandom override CANNOT");
+ TestContext.WriteLine(" attribute that phase's rolls to a seat from mgr state — only the call STACK");
+ TestContext.WriteLine(" (MulliganCtrl._battlePlayer / BattlePlayerBase 'this' / OperateReceive._isPlayer)");
+ TestContext.WriteLine(" names the acting seat.");
+ }
+ }
+}
diff --git a/SVSim.BattleEngine/Engine/RecoveryOperationCollection.cs b/SVSim.BattleEngine/Engine/RecoveryOperationCollection.cs
index fa39ee9..79a011d 100644
--- a/SVSim.BattleEngine/Engine/RecoveryOperationCollection.cs
+++ b/SVSim.BattleEngine/Engine/RecoveryOperationCollection.cs
@@ -18,9 +18,13 @@ public class RecoveryOperationCollection : WatchOperationCollection
public override void PlayHandCardOperation(PlayHandCardReflection networkPlayCardAction, List choiceIdList = null, bool isChoice = false)
{
- List actionDictionary = (_isPlayer ? _receivedData.PlayerTargetDataList : _receivedData.OpponentTargetDataList);
- BattlePlayerBase battlePlayer = _networkBattleMgr.GetBattlePlayer(_isPlayer);
- CommonPlayHandCardOperation(networkPlayCardAction, battlePlayer, _isPlayer, actionDictionary, choiceIdList, isChoice);
+ // Route ALL recovery hand-plays through PlayAction (the type:31 PLAY_HAND_SELECT path).
+ // PlayAction resolves targets from the receiver's target data and calls PlayActionMove,
+ // which bypasses PlayMove's two-phase user-select guard (the guard that aborts on targeted
+ // spells with SendEcho+return, waiting for a follow-up type:31 frame that never comes in
+ // recovery/shadow mode). PlayAction is the path RecoveryOperationCollection already uses
+ // for type:31; unifying type:30 here makes all spell plays resolve headless.
+ PlaySkillSelectHandCardOperation(networkPlayCardAction, choiceIdList);
}
public override void PlaySkillSelectHandCardOperation(PlayHandCardReflection networkPlayCardAction, List choiceIds = null)
diff --git a/SVSim.BattleEngine/SVSim.BattleEngine.csproj b/SVSim.BattleEngine/SVSim.BattleEngine.csproj
index 9dc3bae..e008965 100644
--- a/SVSim.BattleEngine/SVSim.BattleEngine.csproj
+++ b/SVSim.BattleEngine/SVSim.BattleEngine.csproj
@@ -18,4 +18,10 @@
true
+
+
+
+
+
diff --git a/SVSim.BattleEngine/Shim/View/HeadlessHandViewStub.cs b/SVSim.BattleEngine/Shim/View/HeadlessHandViewStub.cs
index c85bc1a..1a8fb21 100644
--- a/SVSim.BattleEngine/Shim/View/HeadlessHandViewStub.cs
+++ b/SVSim.BattleEngine/Shim/View/HeadlessHandViewStub.cs
@@ -9,6 +9,7 @@
// the abstract RearrangeHand is never reached). Nothing here touches game state.
using UnityEngine;
+using Wizard.Battle.View.Vfx;
namespace Wizard.Battle.View
{
@@ -24,5 +25,24 @@ namespace Wizard.Battle.View
protected override void RearrangeHand(float rearrangeTime, bool isNewReplayMoveTurn = false) { }
protected override HandControl CreateHandControl(GameObject handGameObject, BattleCamera battleCamera) => null;
+
+ // HEADLESS-FIX: with CreateHandControl returning null, the base implementations of
+ // HandUnfocus/HandFocus/FocusRearrangeHandHand (HandViewBase.cs:124/133/142) NRE on
+ // `_handControl.SetHandState(...)`. These are PURE PRESENTATION methods — they ease the hand
+ // cards in/out visually as a side effect of leader healing, spell selection, etc. — with no
+ // game-state implications, so the safe headless behavior is a no-op returning NullVfx.
+ //
+ // Live regression: bid 799755786270 (2026-06-07). A follower with a `when_spell_play` Heal
+ // trigger fired on its leader for 0 (the trigger fires regardless of heal amount, and even a
+ // 0-heal still drives `ApplyHealing` → `CreatePullHandInVfx` → `HandView.HandUnfocus()`
+ // unconditionally per ClassBattleCardBase.cs:234/239). Stack:
+ // Skill_heal.Start → ClassBattleCardBase.ApplyHealing → CreatePullHandInVfx
+ // → HandViewBase.HandUnfocus → NRE on null _handControl.
+ // Same pattern as the metamorphose-NRE shim fix (ViewUiTouchStubs.cs's
+ // BattleCardView.GameObject lazy non-null): production Unity touches that the headless
+ // engine needs to no-op rather than throw.
+ public override VfxBase HandUnfocus() => NullVfx.GetInstance();
+ public override VfxBase HandFocus() => NullVfx.GetInstance();
+ public override VfxBase FocusRearrangeHandHand() => NullVfx.GetInstance();
}
}
diff --git a/SVSim.BattleEngine/Shim/View/ViewUiTouchStubs.cs b/SVSim.BattleEngine/Shim/View/ViewUiTouchStubs.cs
index d3ea9df..29ab83e 100644
--- a/SVSim.BattleEngine/Shim/View/ViewUiTouchStubs.cs
+++ b/SVSim.BattleEngine/Shim/View/ViewUiTouchStubs.cs
@@ -28,7 +28,23 @@ namespace Wizard.Battle.View
new InPlayCardFrameEffectControl(null, null, null);
// AttackTargetSelectInfo provided by Generated/BattleCardView_AttackTargetSelectInfo.g.cs
- public virtual UnityEngine.GameObject GameObject { get; protected set; }
+ //
+ // HEADLESS-FIX: lazily non-null GameObject so unguarded Unity touches on the IsRecovery
+ // path resolve as no-ops instead of NRE-ing on the shim's null default. Matches the
+ // existing Component.gameObject lazy pattern (UnityShim.cs:94). The IsRecovery card-create
+ // delegate (NetworkBattleManagerBase.cs:379) passes null for cardGameObject, which left
+ // BattleCardView.GameObject null and caused Skill_metamorphose.cs:147 (the in-play
+ // metamorphose branch — Petrification etc.) to NRE on
+ // `metamorphosedCard.BattleCardView.GameObject.transform.rotation = Quaternion.identity`,
+ // a purely cosmetic transform reset; making it a no-op preserves the surrounding state
+ // mutations (ReplaceInPlay, SetUpInplay, FlagCardAsDestroyedBySkill, RemoveFromInPlay).
+ // Live regression: bid 283192092460, A's Petrification on B's in-play card idx 1.
+ private UnityEngine.GameObject _gameObject;
+ public virtual UnityEngine.GameObject GameObject
+ {
+ get => _gameObject ??= new UnityEngine.GameObject();
+ protected set => _gameObject = value;
+ }
public HandCardFrameEffectControl HandFrameEffect { get; private set; }
public static HandParameter.IconLayout GetCurrentIconLayout() => default!;
}
diff --git a/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs b/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
index 17525be..3f6fda0 100644
--- a/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
+++ b/SVSim.BattleNode/Lifecycle/BattleFrameDefaults.cs
@@ -15,10 +15,13 @@ internal static class BattleFrameDefaults
public const string PlayerRank = "10";
public const string PlayerBattlePoint = "6270";
- // From frame[8] (Ready). Provenance is "what prod sent"; the client doesn't validate. This is
- // an animation crank value (shared-RNG spin), NOT gameplay randomness — both clients crank it
- // identically and stay synced, so it stays a constant. See the spin-rng audit.
- public const int ReadySpin = 243;
+ // Ready-frame spin. Prod shipped 243 (obfuscation base — the spin-rng audit proved ~99% of the
+ // magnitude is non-gameplay). Our node is authority for BOTH clients; they each crank this on
+ // their own shared _stableRandom, but the shadow engine ingests BOTH sides' Ready frames on ONE
+ // stream — so a non-zero value double-cranks the shadow (243×2 = 486 vs each client's 243),
+ // desynchronizing every subsequent StableRandom draw. Zero eliminates the offset; both clients
+ // and the shadow all start at stream position 0.
+ public const int ReadySpin = 0;
///
/// Server-pushed Judge frame spin value. Prod varies per push (55, 175, 73, ...) — it's
diff --git a/SVSim.BattleNode/Protocol/MsgEnvelope.cs b/SVSim.BattleNode/Protocol/MsgEnvelope.cs
index 0d505dd..f461195 100644
--- a/SVSim.BattleNode/Protocol/MsgEnvelope.cs
+++ b/SVSim.BattleNode/Protocol/MsgEnvelope.cs
@@ -153,7 +153,7 @@ public sealed record MsgEnvelope(
return new MsgEnvelope(uri, viewerId, uuid, bid, retryAttempt, cat, pubSeq, playSeq, new RawBody(bodyDict));
}
- private static object? ToObject(JsonElement el) => el.ValueKind switch
+ internal static object? ToObject(JsonElement el) => el.ValueKind switch
{
JsonValueKind.String => el.GetString(),
// Extracted to a helper because writing the conditional inline as
diff --git a/SVSim.BattleNode/Sessions/BattleSession.cs b/SVSim.BattleNode/Sessions/BattleSession.cs
index 7d14a93..0eee1b9 100644
--- a/SVSim.BattleNode/Sessions/BattleSession.cs
+++ b/SVSim.BattleNode/Sessions/BattleSession.cs
@@ -1,5 +1,7 @@
using System.Net.WebSockets;
+using System.Text.Json;
using Microsoft.Extensions.Logging;
+using SVSim.BattleNode.Lifecycle;
using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Sessions.Dispatch;
using SVSim.BattleNode.Sessions.Dispatch.Handlers;
@@ -35,6 +37,21 @@ public sealed class BattleSession
/// never retried, never fatal.
private bool _engineSetupAttempted;
+ /// Guards: server-generated Deal is fed to the shadow engine exactly once (the first
+ /// occurrence from either LoadedHandler invocation). Deal + Ready are server-generated frames the
+ /// engine needs to drive the mulligan: Deal → StartDeal (cards deck→hand for the player seat,
+ /// _firstDrawList for the opponent), Ready → CompleteMulligan → EnemyChangeCardVfx → opponent
+ /// DrawFirstMulliganCard. Without them the engine's hand stays empty and every play throws
+ /// "Target card was not found in hand cards".
+ private bool _engineDealFed;
+
+ /// Guards: server-generated Ready is fed to the shadow engine exactly once (the first
+ /// Ready addressed to participant A). Fed as isPlayerSeat=false so the recovery path's
+ /// OperateMulligan enters the OperateOppoMulligan branch — the only branch that invokes
+ /// ReceiveOpponentMulligan → EnemyChangeCardVfx → DrawFirstMulliganCard. The player's mulligan
+ /// was already processed during the Swap feed.
+ private bool _engineReadyFed;
+
/// True once this session has acquired the process-wide
/// (and is therefore the single active engine owner). Drives the matching Release at battle
/// end so the next session can take the engine.
@@ -241,13 +258,89 @@ public sealed class BattleSession
}
if (Handlers.TryGetValue(env.Uri, out var handler))
- return handler.Handle(BuildContext(from, env));
+ {
+ var routes = handler.Handle(BuildContext(from, env));
+ try { ShadowFeedServerFrames(routes); }
+ catch (Exception ex)
+ {
+ _log.LogWarning(ex, "BattleSession {Bid}: shadow engine error feeding server frames (ignored)", BattleId);
+ }
+ return routes;
+ }
_log.LogDebug("BattleSession {Bid}: dropping uri={Uri} in lifecycle={Lifecycle} from vid={Vid}",
BattleId, env.Uri, Lifecycle, from.ViewerId);
return Array.Empty();
}
+ /// Feed server-generated mulligan frames (Deal, Swap response, Ready) into the shadow
+ /// engine. These frames are produced by LoadedHandler/SwapHandler and dispatched only to clients
+ /// — they never enter because they're not client-sent. But the engine
+ /// needs them to drive the mulligan: Deal seats the hand, Ready completes the opponent's hand.
+ /// The test harness (NodeNativeBattleHarness) feeds these directly; this method is the
+ /// live-session equivalent.
+ private void ShadowFeedServerFrames(IReadOnlyList routes)
+ {
+ if (!_engine.IsReady) return;
+
+ foreach (var (target, frame, _) in routes)
+ {
+ switch (frame.Uri)
+ {
+ case NetworkBattleUri.Deal when !_engineDealFed:
+ _engineDealFed = true;
+ _log.LogWarning("BattleSession {Bid}: DEAL DIAG BEFORE: {Diag}",
+ BattleId, _engine.DiagnoseDealState());
+ ShadowFeed(frame, isPlayerSeat: true, "Deal");
+ _log.LogWarning("BattleSession {Bid}: DEAL DIAG AFTER: {Diag}",
+ BattleId, _engine.DiagnoseDealState());
+ break;
+
+ case NetworkBattleUri.Swap:
+ // The Swap RESPONSE (server-authored, carries post-mulligan self hand as
+ // pos→idx) must go to the engine for the correct seat. The client-sent Swap
+ // ({idxList}) also enters ShadowIngest but is harmless — its selfIdxList
+ // parses to null (no "self" key) so FirstMulliganOperation no-ops.
+ bool swapIsPlayer = ReferenceEquals(target, A);
+ ShadowFeed(frame, swapIsPlayer, $"SwapResponse({(swapIsPlayer ? "A" : "B")})");
+ break;
+
+ case NetworkBattleUri.Ready when !_engineReadyFed && ReferenceEquals(target, A):
+ _engineReadyFed = true;
+ // Feed A's Ready (carries A's idxChangeSeed → receiver seeds _selfXorShiftRandom).
+ ShadowFeed(frame, isPlayerSeat: false, "Ready");
+ // Seed B's XorShift separately — A's Ready doesn't carry B's seed.
+ _engine.SeedOppoIdxChange(BattleSeeds.IdxChange(_state.MasterSeed, B.ViewerId));
+ break;
+ }
+ }
+ }
+
+ private void ShadowFeed(MsgEnvelope frame, bool isPlayerSeat, string label)
+ {
+ var engineFrame = frame.Body is RawBody ? frame : frame with { Body = ToRawBody(frame.Body) };
+ var r = _engine.Receive(engineFrame, isPlayerSeat);
+ if (r.Diverged)
+ _log.LogWarning("BattleSession {Bid}: shadow engine diverged on {Label} feed: {Reason}",
+ BattleId, label, r.RejectReason);
+ if (frame.Uri is NetworkBattleUri.Deal or NetworkBattleUri.Swap or NetworkBattleUri.Ready)
+ LogEngineHandState(frame.Uri, $"ShadowFeed({label})");
+ }
+
+ private static readonly JsonSerializerOptions _bodyJsonOptions = Wire.WireJsonOptions.CamelCase;
+
+ /// Convert a typed body record (DealBody, SwapResponseBody, ReadyBody, etc.) to the
+ /// the engine receiver expects. Serialize → JsonElement → ToObject (the
+ /// same deep-conversion MsgEnvelope.FromJson uses for incoming wire frames).
+ private static RawBody ToRawBody(IMsgBody? body)
+ {
+ if (body is null) return new RawBody(new Dictionary());
+ var el = JsonSerializer.SerializeToElement(body, body.GetType(), _bodyJsonOptions);
+ var dict = el.EnumerateObject()
+ .ToDictionary(p => p.Name, p => MsgEnvelope.ToObject(p.Value));
+ return new RawBody(dict);
+ }
+
/// Seat the shadow engine once, from the master seed + both deterministically-shuffled
/// decks the node already computed (F-N-5). Attempted a single time; if the host can't seat the
/// engine headless, it stays not-ready and the shadow no-ops for the rest of the battle.
@@ -268,7 +361,16 @@ public sealed class BattleSession
return;
}
_engineOwned = true;
- _engine.Setup(_state.MasterSeed,
+ // Seed the engine's StableRandom with BattleSeeds.Stable(MasterSeed) — the SAME value the
+ // Matched frame ships to both clients (InitBattleHandler.cs:28). The clients seed their
+ // System.Random with Matched.seed (BattleManagerBase.cs:721), so the engine's stream must
+ // share that derivation to track. MasterSeed itself is a root only — every wire-facing seed
+ // (Stable, IdxChange, DeckShuffle) is a BattleSeeds.Derive(...) of it; the engine never
+ // consumes the root directly. Live regression: bid 654473755566 had MasterSeed=1184631275
+ // and Stable=1543475792 (the Matched.seed); seeding the engine with the raw root made every
+ // turn-1+ draw pick a different deck position than the clients, so the opponent's first
+ // non-mulligan play addressed a card the engine never drew → HandCardToField threw.
+ _engine.Setup(BattleSeeds.Stable(_state.MasterSeed),
_state.GetShuffledDeck(A), _state.GetShuffledDeck(B),
(int)A.Context.ClassId, (int)B.Context.ClassId);
}
@@ -279,8 +381,21 @@ public sealed class BattleSession
bool isPlayerSeat = ReferenceEquals(from, A);
var r = _engine.Receive(env, isPlayerSeat);
if (r.Diverged)
- _log.LogInformation("BattleSession {Bid}: shadow engine diverged on {Uri}: {Reason}",
+ _log.LogWarning("BattleSession {Bid}: shadow engine diverged on {Uri}: {Reason}",
BattleId, env.Uri, r.RejectReason);
+ if (env.Uri is NetworkBattleUri.Swap or NetworkBattleUri.TurnStart or NetworkBattleUri.PlayActions)
+ LogEngineHandState(env.Uri, $"ShadowIngest(seat={(isPlayerSeat ? "A" : "B")})");
+ }
+
+ private void LogEngineHandState(NetworkBattleUri uri, string label)
+ {
+ if (!_engine.IsReady) return;
+ var aIdxs = string.Join(",", Enumerable.Range(0, _engine.HandCount(true))
+ .Select(i => _engine.HandCardIndex(true, i)));
+ var bIdxs = string.Join(",", Enumerable.Range(0, _engine.HandCount(false))
+ .Select(i => _engine.HandCardIndex(false, i)));
+ _log.LogInformation("BattleSession {Bid}: engine hand after {Uri} {Label}: A=[{AHand}] B=[{BHand}]",
+ BattleId, uri, label, aIdxs, bIdxs);
}
}
diff --git a/SVSim.BattleNode/Sessions/Engine/SessionBattleEngine.cs b/SVSim.BattleNode/Sessions/Engine/SessionBattleEngine.cs
index e1dcde4..cf8f577 100644
--- a/SVSim.BattleNode/Sessions/Engine/SessionBattleEngine.cs
+++ b/SVSim.BattleNode/Sessions/Engine/SessionBattleEngine.cs
@@ -66,15 +66,43 @@ internal sealed class SessionBattleEngine
public void Setup(int masterSeed,
IReadOnlyList seatADeck, IReadOnlyList seatBDeck,
int seatAClass = 1, int seatBClass = 2)
+ => SetupInternal(masterSeed, seatADeck, seatBDeck, seatAClass, seatBClass, rng: null);
+
+ /// TEST/DEBUG SEAM (Phase 4 Option-A viability PROBE — NOT a production fix). Identical to
+ /// but installs a logging
+ /// RNG source that, on EVERY StableRandom/StableRandomDouble roll, records a roll entry
+ /// (call index, API, the seat signals readable from mgr state at roll time, and the live call stack).
+ /// Lets a test answer: at roll time, is the ACTING SEAT determinable from mgr state alone, or only from
+ /// the stack? No production path calls this.
+ internal IReadOnlyList DebugSetupWithRollLog(int masterSeed,
+ IReadOnlyList seatADeck, IReadOnlyList seatBDeck,
+ int seatAClass = 1, int seatBClass = 2)
+ {
+ var log = new List();
+ // The logger needs the mgr to read seat signals at roll time; the mgr is built inside Setup, so the
+ // logger reads it lazily via a closure populated right after construction.
+ HeadlessNetworkBattleMgr[] mgrBox = { null! };
+ var rng = new RollLoggingRandomSource(new SeededRandomSource(masterSeed), log, () => mgrBox[0]);
+ SetupInternal(masterSeed, seatADeck, seatBDeck, seatAClass, seatBClass, rng, mgrBox);
+ return log;
+ }
+
+ private void SetupInternal(int masterSeed,
+ IReadOnlyList seatADeck, IReadOnlyList seatBDeck,
+ int seatAClass, int seatBClass,
+ IRandomSource? rng, HeadlessNetworkBattleMgr[]? mgrBox = null)
{
// Prime the engine's process-global statics (CardMaster, Wizard.Data, all-8-class Master,
// GameMgr/netUser/udid). Idempotent (process-once); makes the LIVE host ready so Setup succeeds
// here rather than throwing into the shadow's no-op path (Phase 2 N2, carried-risk A).
EngineGlobalInit.EnsureInitialized();
- // rng defaults to SeededRandomSource(masterSeed) inside the mgr — the stream is born aligned
- // with the seed the node handed both clients (F-N-5; O-N-2 "bit-aligned anyway").
- var mgr = new HeadlessNetworkBattleMgr(new SessionContentsCreator(masterSeed));
+ // rng defaults to SeededRandomSource(masterSeed) inside the mgr — masterSeed here is the
+ // engine's StableRandom seed (parameter name preserved for API compatibility; callers pass
+ // BattleSeeds.Stable(rootMasterSeed) so the stream is born aligned with the seed the node
+ // ships to both clients in Matched.seed). F-N-5; O-N-2 "bit-aligned anyway".
+ var mgr = new HeadlessNetworkBattleMgr(new SessionContentsCreator(masterSeed), rng);
+ if (mgrBox is not null) mgrBox[0] = mgr; // publish for the test roll-logger closure (DebugSetupWithRollLog)
// Recovery mode is the engine's OWN headless replay path: the live view/UI touches on the
// receive cycle (BattleUIContainer.DisableMenu, turn-control UI, card-view creation, VFX
// waits) are all gated `!IsRecovery` (BattleUIContainer.cs:130, BattleManagerBase.cs:1499+),
@@ -93,15 +121,20 @@ internal sealed class SessionBattleEngine
player.IsSelfTurn = true;
enemy.IsSelfTurn = false;
- // Seat the evolve points + evolve-wait-turn counters exactly as the real match-load's
- // SetupInitialGameState -> SetupEvolCount does (BattleManagerBase.cs:1115/1132). The headless
- // Setup builds the seats by hand and never runs SetupInitialGameState, so without this both seats'
- // CurrentEpCount/EvolveWaitTurnCount stay at their field defaults (0/0) and CanEvolution always
- // fails (CurrentEpCount - GetEp() < 0). doesPlayerGoFirst == false here: seat A (BattlePlayer) is
- // the SECOND player (IsFirst defaults false; seat A's turn-1 draws 2), so it gets SECOND_PLAYER_EP
- // (3) + EvolveWaitTurnCount 4, and seat B (BattleEnemy, first) gets FIRST_PLAYER_EP (2) +
- // EvolveWaitTurnCount 5. TurnEvolveControl (run on each TurnStart receive) counts the wait down.
- mgr.SetupEvolCount(doesPlayerGoFirst: false);
+ // Participant A always goes first (LoadedHandler gives A TurnState.First). The engine's
+ // BattlePlayer = isPlayer=true = seat A, so doesPlayerGoFirst must be true. This controls:
+ // (1) SetupEvolCount: first player gets FIRST_PLAYER_EP (2) + wait 5,
+ // second player gets SECOND_PLAYER_EP (3) + wait 4
+ // (2) IsFirst → BattlePlayer.IsGameFirst / BattleEnemy.IsGameFirst → turn-1 draw count:
+ // first player draws 1, second draws 2 (BattlePlayerBase.TurnStartDrawCard)
+ mgr.IsFirst = true;
+ mgr.SetupEvolCount(doesPlayerGoFirst: true);
+
+ // The real match-load's SetupInitialGameState(areCardsRandomlyDrawn:true) sets this flag
+ // (BattleManagerBase.cs:1110), routing LotteryRandomDrawCard through seeded StableRandom
+ // instead of top-of-deck. Without it the shadow draws DeckCardList[0] every time while
+ // clients draw seeded-random — desynchronizing the hand and every downstream field.
+ BattleManagerBase.IsRandomDraw = true;
InitLeaderLife(mgr); // a 0-life leader reads as game-over and silently blocks plays
InitCardTemplates(mgr); // play/draw resolution touches the (no-op) card view layer
@@ -136,6 +169,7 @@ internal sealed class SessionBattleEngine
var dict = ToEngineDict((env.Body as RawBody)?.Entries);
TranslateTargetOwners(dict, isPlayerSeat);
+ TranslateChoiceKeyAction(dict);
var uri = MapUri(env.Uri);
try
@@ -210,6 +244,71 @@ internal sealed class SessionBattleEngine
private const string TargetListKey = "targetList";
private const string VidKey = "vid";
private const string IsSelfKey = "isSelf";
+ private const string KeyActionKey = "keyAction";
+ private const string SelectCardKey = "selectCard";
+ private const string CardIdKey = "cardId";
+
+ // --- live Choice-keyAction shape translation (live PvP ingest fidelity) ------------------------
+ //
+ // THE GAP this closes: a Choice play's wire keyAction entry on the SENDER's send is the wrapped
+ // shape `{type:1, cardId:, selectCard:{cardId:[...], open:0|1}}` (verified
+ // in client-send captures, e.g. data_dumps/captures/battle_test/cl1/battle-traffic.ndjson live
+ // Resonance play). The engine's receive parser (NetworkBattleReceiver.cs:1202) reads the
+ // `selectCard` value through `ConvertToListInt`, which does `value as List