process TODO.md step 10

Assets/Scripts/MovementComponent.cs

@@ -50,6 +50,36 @@ public static class ClientGameplayInputFlow
             TargetId = targetId ?? string.Empty
         };
     }
+
+    public static void SendShootInput(
+        MessageManager messageManager,
+        string playerId,
+        long tick,
+        Vector3 aimDirection,
+        string targetId = "")
+    {
+        if (messageManager == null)
+        {
+            throw new System.ArgumentNullException(nameof(messageManager));
+        }
+
+        SendShootInput(messageManager, CreateShootInput(playerId, tick, aimDirection, targetId));
+    }
+
+    public static void SendShootInput(MessageManager messageManager, ShootInput message)
+    {
+        if (messageManager == null)
+        {
+            throw new System.ArgumentNullException(nameof(messageManager));
+        }
+
+        if (message == null)
+        {
+            throw new System.ArgumentNullException(nameof(message));
+        }
+
+        messageManager.SendMessage(message, MessageType.ShootInput);
+    }
 }
 
 public class MovementComponent : MonoBehaviour

Assets/Scripts/NetworkManager.cs

@@ -215,12 +215,13 @@ public class NetworkManager : MonoBehaviour
 
     public void SendShootInput(string playerId, Vector3 direction, long tick = 0, string targetId = "")
     {
-        SendShootInput(ClientGameplayInputFlow.CreateShootInput(playerId, tick, direction, targetId));
+        ClientGameplayInputFlow.SendShootInput(_networkRuntime.MessageManager, playerId, tick, direction, targetId);
+        Debug.Log($"PlayerShootSeq: {_sequence++}");
     }
 
     public void SendShootInput(ShootInput message)
     {
-        _networkRuntime.MessageManager.SendMessage(message, MessageType.ShootInput);
+        ClientGameplayInputFlow.SendShootInput(_networkRuntime.MessageManager, message);
         Debug.Log($"PlayerShootSeq: {_sequence++}");
     }
 

Assets/Tests/EditMode/Network/ClientGameplayFlowTests.cs

@@ -0,0 +1,161 @@
+using System.Net;
+using Network.Defines;
+using Network.NetworkApplication;
+using NUnit.Framework;
+using UnityEngine;
+using Vector3 = UnityEngine.Vector3;
+
+namespace Tests.EditMode.Network
+{
+    public class ClientGameplayFlowTests
+    {
+        private static readonly IPEndPoint Sender = new(IPAddress.Loopback, 9300);
+
+        [Test]
+        public void ClientGameplayInputFlow_SendShootInput_UsesDedicatedGameplayPathAndReliableLane()
+        {
+            var reliableTransport = new GameplayFlowFakeTransport();
+            var syncTransport = new GameplayFlowFakeTransport();
+            var manager = new MessageManager(
+                reliableTransport,
+                new MainThreadNetworkDispatcher(),
+                new DefaultMessageDeliveryPolicyResolver(),
+                syncTransport);
+
+            ClientGameplayInputFlow.SendShootInput(
+                manager,
+                "player-1",
+                17,
+                new Vector3(3f, 0f, 4f),
+                "enemy-1");
+
+            Assert.That(reliableTransport.SentMessages.Count, Is.EqualTo(1));
+            Assert.That(syncTransport.SentMessages.Count, Is.EqualTo(0));
+
+            var envelope = Envelope.Parser.ParseFrom(reliableTransport.SentMessages[0]);
+            var shootInput = ShootInput.Parser.ParseFrom(envelope.Payload);
+            Assert.That((MessageType)envelope.Type, Is.EqualTo(MessageType.ShootInput));
+            Assert.That(shootInput.PlayerId, Is.EqualTo("player-1"));
+            Assert.That(shootInput.Tick, Is.EqualTo(17));
+            Assert.That(shootInput.DirX, Is.EqualTo(0.6f).Within(0.0001f));
+            Assert.That(shootInput.DirY, Is.EqualTo(0.8f).Within(0.0001f));
+            Assert.That(shootInput.TargetId, Is.EqualTo("enemy-1"));
+        }
+
+        [Test]
+        public void SharedNetworkRuntime_CombatEventReceivePath_AppliesAuthoritativeDamageAndDeath()
+        {
+            var transport = new GameplayFlowFakeTransport();
+            var runtime = new SharedNetworkRuntime(transport, new MainThreadNetworkDispatcher());
+            var harness = new ClientGameplayTestHarness("player-1");
+            harness.Register(runtime.MessageManager);
+
+            transport.EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.PlayerState,
+                    GameplayFlowTestSupport.CreatePlayerState("player-1", 10, Vector3.zero, hp: 100)),
+                Sender);
+            transport.EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.CombatEvent,
+                    new CombatEvent
+                    {
+                        Tick = 11,
+                        EventType = CombatEventType.DamageApplied,
+                        AttackerId = "enemy-1",
+                        TargetId = "player-1",
+                        Damage = 35,
+                        HitPosition = new global::Network.Defines.Vector3 { X = 2f, Y = 0f, Z = 1f }
+                    }),
+                Sender);
+            transport.EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.CombatEvent,
+                    new CombatEvent
+                    {
+                        Tick = 12,
+                        EventType = CombatEventType.Death,
+                        AttackerId = "enemy-1",
+                        TargetId = "player-1"
+                    }),
+                Sender);
+
+            runtime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+
+            Assert.That(harness.TryGetState("player-1", out var snapshot), Is.True);
+            Assert.That(snapshot.Hp, Is.EqualTo(0));
+            Assert.That(harness.TryGetCombatPresentation("player-1", out var combatPresentation), Is.True);
+            Assert.That(combatPresentation.HasLastEvent, Is.True);
+            Assert.That(combatPresentation.LastEventType, Is.EqualTo(CombatEventType.Death));
+            Assert.That(combatPresentation.IsDead, Is.True);
+        }
+
+        [Test]
+        public void SharedNetworkRuntime_CombatEventReceivePath_RoutesShootRejectedToAttackerDiagnostics()
+        {
+            var transport = new GameplayFlowFakeTransport();
+            var runtime = new SharedNetworkRuntime(transport, new MainThreadNetworkDispatcher());
+            var harness = new ClientGameplayTestHarness("player-1");
+            harness.Register(runtime.MessageManager);
+
+            transport.EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.PlayerState,
+                    GameplayFlowTestSupport.CreatePlayerState("player-1", 20, Vector3.zero, hp: 90)),
+                Sender);
+            transport.EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.CombatEvent,
+                    new CombatEvent
+                    {
+                        Tick = 21,
+                        EventType = CombatEventType.ShootRejected,
+                        AttackerId = "player-1",
+                        TargetId = "enemy-2"
+                    }),
+                Sender);
+
+            runtime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+
+            Assert.That(harness.TryGetState("player-1", out var snapshot), Is.True);
+            Assert.That(snapshot.Hp, Is.EqualTo(90));
+            Assert.That(harness.TryGetCombatPresentation("player-1", out var combatPresentation), Is.True);
+            Assert.That(combatPresentation.LastEventType, Is.EqualTo(CombatEventType.ShootRejected));
+            Assert.That(combatPresentation.LastDamage, Is.EqualTo(0));
+            Assert.That(combatPresentation.IsDead, Is.False);
+        }
+
+        [Test]
+        public void ClientGameplayHarness_RemotePlayerStateFlow_RejectsStaleSnapshots_AndUsesInterpolationOrLatestClamp()
+        {
+            var harness = new ClientGameplayTestHarness("local-player");
+
+            var firstAccepted = harness.HandlePlayerState(
+                GameplayFlowTestSupport.CreatePlayerState("remote-player", 10, new Vector3(0f, 0f, 0f), rotation: 0f),
+                receivedAtSeconds: 0f);
+            var secondAccepted = harness.HandlePlayerState(
+                GameplayFlowTestSupport.CreatePlayerState("remote-player", 11, new Vector3(10f, 0f, 0f), rotation: 90f),
+                receivedAtSeconds: 0.05f);
+            var staleAccepted = harness.HandlePlayerState(
+                GameplayFlowTestSupport.CreatePlayerState("remote-player", 9, new Vector3(99f, 0f, 0f), rotation: 180f),
+                receivedAtSeconds: 0.06f);
+
+            var interpolated = harness.SampleRemote("remote-player", 0.125f);
+            var clamped = harness.SampleRemote("remote-player", 0.35f);
+
+            Assert.That(firstAccepted, Is.True);
+            Assert.That(secondAccepted, Is.True);
+            Assert.That(staleAccepted, Is.False);
+            Assert.That(harness.GetBufferedSnapshotCount("remote-player"), Is.EqualTo(1));
+            Assert.That(harness.GetLatestBufferedTick("remote-player"), Is.EqualTo(11));
+            Assert.That(interpolated.HasValue, Is.True);
+            Assert.That(interpolated.UsedInterpolation, Is.True);
+            Assert.That(interpolated.Position.x, Is.EqualTo(5f).Within(0.001f));
+            Assert.That(interpolated.Rotation.eulerAngles.y, Is.EqualTo(45f).Within(0.01f));
+            Assert.That(clamped.HasValue, Is.True);
+            Assert.That(clamped.UsedInterpolation, Is.False);
+            Assert.That(clamped.LatestSnapshot.Tick, Is.EqualTo(11));
+            Assert.That(clamped.Position, Is.EqualTo(new Vector3(10f, 0f, 0f)));
+        }
+    }
+}

Assets/Tests/EditMode/Network/ClientGameplayFlowTests.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 6a4fcc49ae3441f6bc9f251af0f1f067
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Tests/EditMode/Network/GameplayFlowRoundTripTests.cs

@@ -0,0 +1,139 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+using Network.Defines;
+using Network.NetworkApplication;
+using Network.NetworkHost;
+using NUnit.Framework;
+using UnityEngine;
+using Vector3 = UnityEngine.Vector3;
+
+namespace Tests.EditMode.Network
+{
+    public class GameplayFlowRoundTripTests
+    {
+        private static readonly IPEndPoint ClientPeer = new(IPAddress.Loopback, 9401);
+        private static readonly IPEndPoint RemotePeer = new(IPAddress.Loopback, 9402);
+        private static readonly IPEndPoint ServerSender = new(IPAddress.Loopback, 9000);
+
+        [Test]
+        public void FakeTransportRoundTrip_MoveInputAndShootInput_ProduceAuthoritativePlayerStateAndCombatEvent()
+        {
+            var clientReliableTransport = new GameplayFlowFakeTransport();
+            var clientSyncTransport = new GameplayFlowFakeTransport();
+            var clientRuntime = new SharedNetworkRuntime(
+                clientReliableTransport,
+                new MainThreadNetworkDispatcher(),
+                syncTransport: clientSyncTransport);
+            var clientHarness = new ClientGameplayTestHarness("player-a");
+            clientHarness.Register(clientRuntime.MessageManager);
+
+            var serverTransports = new Dictionary<int, GameplayFlowFakeTransport>();
+            var configuration = new ServerRuntimeConfiguration(9000)
+            {
+                SyncPort = 9001,
+                Dispatcher = new MainThreadNetworkDispatcher(),
+                TransportFactory = port => CreateTransport(serverTransports, port),
+                AuthoritativeMovement = new ServerAuthoritativeMovementConfiguration
+                {
+                    MoveSpeed = 10f,
+                    BroadcastInterval = TimeSpan.FromMilliseconds(50),
+                    DefaultHp = 100
+                },
+                AuthoritativeCombat = new ServerAuthoritativeCombatConfiguration
+                {
+                    DamagePerShot = 30
+                }
+            };
+
+            clientRuntime.StartAsync().GetAwaiter().GetResult();
+            using var serverRuntime = ServerRuntimeEntryPoint.StartAsync(configuration).GetAwaiter().GetResult();
+
+            serverTransports[9001].EmitReceive(
+                GameplayFlowTestSupport.BuildEnvelope(
+                    MessageType.MoveInput,
+                    new MoveInput
+                    {
+                        PlayerId = "player-b",
+                        Tick = 1,
+                        MoveX = 0f,
+                        MoveY = 0f
+                    }),
+                RemotePeer);
+            serverRuntime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+            serverTransports[9001].ClearOutgoing();
+            serverTransports[9000].ClearOutgoing();
+
+            clientRuntime.MessageManager.SendMessage(
+                new MoveInput
+                {
+                    PlayerId = "player-a",
+                    Tick = 1,
+                    MoveX = 1f,
+                    MoveY = 0f
+                },
+                MessageType.MoveInput);
+            ClientGameplayInputFlow.SendShootInput(
+                clientRuntime.MessageManager,
+                "player-a",
+                2,
+                Vector3.right,
+                "player-b");
+
+            TransferSentMessages(clientSyncTransport, serverTransports[9001], ClientPeer);
+            TransferSentMessages(clientReliableTransport, serverTransports[9000], ClientPeer);
+
+            serverRuntime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+            serverRuntime.UpdateAuthoritativeMovement(TimeSpan.FromMilliseconds(50));
+
+            TransferBroadcastMessages(serverTransports[9000], clientReliableTransport, ServerSender);
+            clientRuntime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+            TransferBroadcastMessages(serverTransports[9001], clientSyncTransport, ServerSender);
+            clientRuntime.DrainPendingMessagesAsync().GetAwaiter().GetResult();
+
+            Assert.That(serverRuntime.TryGetAuthoritativeMovementState(ClientPeer, out var localServerState), Is.True);
+            Assert.That(localServerState.PlayerId, Is.EqualTo("player-a"));
+            Assert.That(localServerState.PositionX, Is.EqualTo(0.5f).Within(0.0001f));
+            Assert.That(serverRuntime.TryGetAuthoritativeCombatState(RemotePeer, out var remoteCombatState), Is.True);
+            Assert.That(remoteCombatState.PlayerId, Is.EqualTo("player-b"));
+            Assert.That(remoteCombatState.Hp, Is.EqualTo(70));
+
+            Assert.That(clientHarness.TryGetState("player-a", out var localClientState), Is.True);
+            Assert.That(localClientState.Tick, Is.EqualTo(1));
+            Assert.That(localClientState.Position.x, Is.EqualTo(0.5f).Within(0.0001f));
+            Assert.That(clientHarness.TryGetState("player-b", out var remoteClientState), Is.True);
+            Assert.That(remoteClientState.Hp, Is.EqualTo(70));
+            Assert.That(clientHarness.TryGetCombatPresentation("player-b", out var remoteCombatPresentation), Is.True);
+            Assert.That(remoteCombatPresentation.LastEventType, Is.EqualTo(CombatEventType.DamageApplied));
+            Assert.That(remoteCombatPresentation.LastDamage, Is.EqualTo(30));
+            Assert.That(remoteCombatPresentation.IsDead, Is.False);
+        }
+
+        private static GameplayFlowFakeTransport CreateTransport(IDictionary<int, GameplayFlowFakeTransport> serverTransports, int port)
+        {
+            var transport = new GameplayFlowFakeTransport();
+            serverTransports.Add(port, transport);
+            return transport;
+        }
+
+        private static void TransferSentMessages(GameplayFlowFakeTransport source, GameplayFlowFakeTransport destination, IPEndPoint sender)
+        {
+            foreach (var payload in source.SentMessages)
+            {
+                destination.EmitReceive(payload, sender);
+            }
+
+            source.ClearOutgoing();
+        }
+
+        private static void TransferBroadcastMessages(GameplayFlowFakeTransport source, GameplayFlowFakeTransport destination, IPEndPoint sender)
+        {
+            foreach (var payload in source.BroadcastMessages)
+            {
+                destination.EmitReceive(payload, sender);
+            }
+
+            source.ClearOutgoing();
+        }
+    }
+}

Assets/Tests/EditMode/Network/GameplayFlowRoundTripTests.cs.meta

@@ -0,0 +1,11 @@
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+guid: bbe6dfdb34f64d4e895f57f7191b9407
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Tests/EditMode/Network/GameplayFlowTestSupport.cs

@@ -0,0 +1,230 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Threading.Tasks;
+using Google.Protobuf;
+using Network.Defines;
+using Network.NetworkApplication;
+using Network.NetworkTransport;
+using UnityEngine;
+using Vector3 = UnityEngine.Vector3;
+
+namespace Tests.EditMode.Network
+{
+    internal sealed class ClientGameplayTestHarness
+    {
+        private readonly string localPlayerId;
+        private readonly Dictionary<string, ClientAuthoritativePlayerState> states = new();
+        private readonly Dictionary<string, RemotePlayerSnapshotInterpolator> remoteInterpolators = new();
+
+        public ClientGameplayTestHarness(string localPlayerId)
+        {
+            this.localPlayerId = localPlayerId ?? string.Empty;
+        }
+
+        public void Register(MessageManager messageManager)
+        {
+            messageManager.RegisterHandler(MessageType.PlayerState, (payload, sender) =>
+            {
+                HandlePlayerState(PlayerState.Parser.ParseFrom(payload), receivedAtSeconds: 0f);
+            });
+            messageManager.RegisterHandler(MessageType.CombatEvent, (payload, sender) =>
+            {
+                HandleCombatEvent(CombatEvent.Parser.ParseFrom(payload));
+            });
+        }
+
+        public bool HandlePlayerState(PlayerState state, float receivedAtSeconds)
+        {
+            var owner = GetOrCreateOwner(state.PlayerId);
+            var accepted = owner.TryAccept(state, out var snapshot);
+            if (!accepted)
+            {
+                return false;
+            }
+
+            if (!IsLocalPlayer(state.PlayerId))
+            {
+                GetOrCreateInterpolator(state.PlayerId).TryAddSnapshot(snapshot, receivedAtSeconds);
+            }
+
+            return true;
+        }
+
+        public bool HandleCombatEvent(CombatEvent combatEvent)
+        {
+            if (!ClientCombatEventRouting.TryGetAffectedPlayerId(combatEvent, out var playerId))
+            {
+                return false;
+            }
+
+            var owner = GetOrCreateOwner(playerId);
+            return owner.TryApplyCombatEvent(combatEvent, playerId, out _, out _);
+        }
+
+        public bool TryGetState(string playerId, out ClientAuthoritativePlayerStateSnapshot snapshot)
+        {
+            if (states.TryGetValue(playerId, out var owner) && owner.Current != null)
+            {
+                snapshot = owner.Current;
+                return true;
+            }
+
+            snapshot = null;
+            return false;
+        }
+
+        public bool TryGetCombatPresentation(string playerId, out ClientCombatPresentationSnapshot snapshot)
+        {
+            if (states.TryGetValue(playerId, out var owner))
+            {
+                snapshot = owner.CombatPresentation;
+                return true;
+            }
+
+            snapshot = ClientCombatPresentationSnapshot.Empty;
+            return false;
+        }
+
+        public int GetBufferedSnapshotCount(string playerId)
+        {
+            return remoteInterpolators.TryGetValue(playerId, out var interpolator)
+                ? interpolator.BufferedSnapshotCount
+                : 0;
+        }
+
+        public long GetLatestBufferedTick(string playerId)
+        {
+            return remoteInterpolators.TryGetValue(playerId, out var interpolator)
+                ? interpolator.LatestBufferedTick
+                : -1;
+        }
+
+        public RemotePlayerInterpolationSample SampleRemote(string playerId, float nowSeconds)
+        {
+            return GetOrCreateInterpolator(playerId).Sample(nowSeconds);
+        }
+
+        private bool IsLocalPlayer(string playerId)
+        {
+            return string.Equals(playerId, localPlayerId, StringComparison.Ordinal);
+        }
+
+        private ClientAuthoritativePlayerState GetOrCreateOwner(string playerId)
+        {
+            if (!states.TryGetValue(playerId, out var owner))
+            {
+                owner = new ClientAuthoritativePlayerState();
+                states.Add(playerId, owner);
+            }
+
+            return owner;
+        }
+
+        private RemotePlayerSnapshotInterpolator GetOrCreateInterpolator(string playerId)
+        {
+            if (!remoteInterpolators.TryGetValue(playerId, out var interpolator))
+            {
+                interpolator = new RemotePlayerSnapshotInterpolator();
+                remoteInterpolators.Add(playerId, interpolator);
+            }
+
+            return interpolator;
+        }
+    }
+
+    internal sealed class GameplayFlowFakeTransport : ITransport
+    {
+        private readonly List<byte[]> sentMessages = new();
+        private readonly List<byte[]> targetMessages = new();
+        private readonly List<(byte[] Data, IPEndPoint Target)> targetedSends = new();
+        private readonly List<byte[]> broadcastMessages = new();
+
+        public event Action<byte[], IPEndPoint> OnReceive;
+
+        public IReadOnlyList<byte[]> SentMessages => sentMessages;
+
+        public IReadOnlyList<byte[]> TargetMessages => targetMessages;
+
+        public IReadOnlyList<(byte[] Data, IPEndPoint Target)> TargetedSends => targetedSends;
+
+        public IReadOnlyList<byte[]> BroadcastMessages => broadcastMessages;
+
+        public Task StartAsync()
+        {
+            return Task.CompletedTask;
+        }
+
+        public void Stop()
+        {
+        }
+
+        public void Send(byte[] data)
+        {
+            sentMessages.Add(Copy(data));
+        }
+
+        public void SendTo(byte[] data, IPEndPoint target)
+        {
+            var copy = Copy(data);
+            targetMessages.Add(copy);
+            targetedSends.Add((copy, target));
+        }
+
+        public void SendToAll(byte[] data)
+        {
+            broadcastMessages.Add(Copy(data));
+        }
+
+        public void EmitReceive(byte[] data, IPEndPoint sender)
+        {
+            OnReceive?.Invoke(Copy(data), sender);
+        }
+
+        public void ClearOutgoing()
+        {
+            sentMessages.Clear();
+            targetMessages.Clear();
+            targetedSends.Clear();
+            broadcastMessages.Clear();
+        }
+
+        private static byte[] Copy(byte[] data)
+        {
+            if (data == null)
+            {
+                return null;
+            }
+
+            var copy = new byte[data.Length];
+            Array.Copy(data, copy, data.Length);
+            return copy;
+        }
+    }
+
+    internal static class GameplayFlowTestSupport
+    {
+        public static byte[] BuildEnvelope(MessageType type, IMessage payload)
+        {
+            return new Envelope
+            {
+                Type = (int)type,
+                Payload = payload.ToByteString()
+            }.ToByteArray();
+        }
+
+        public static PlayerState CreatePlayerState(string playerId, long tick, Vector3 position, int hp = 100, float rotation = 0f, Vector3? velocity = null)
+        {
+            var resolvedVelocity = velocity ?? Vector3.zero;
+            return new PlayerState
+            {
+                PlayerId = playerId,
+                Tick = tick,
+                Position = new global::Network.Defines.Vector3 { X = position.x, Y = position.y, Z = position.z },
+                Velocity = new global::Network.Defines.Vector3 { X = resolvedVelocity.x, Y = resolvedVelocity.y, Z = resolvedVelocity.z },
+                Rotation = rotation,
+                Hp = hp
+            };
+        }
+    }
+}

Assets/Tests/EditMode/Network/GameplayFlowTestSupport.cs.meta

@@ -0,0 +1,11 @@
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TODO.md

@@ -31,8 +31,8 @@ Still missing for MVP:
 - [ ] Full `PlayerState` field application for rotation / HP / velocity
 - [ ] Remote-player snapshot buffering and interpolation strategy
 - [x] Explicit movement-stop handling via zero-input `MoveInput`
-- [ ] End-to-end gameplay regression coverage
+- [x] End-to-end gameplay regression coverage
-- [ ] Re-run build/test in an environment with the required .NET runtime installed
+- [x] Re-run build/test in an environment with the required .NET runtime installed
 
 ## Checklist
 
@@ -154,33 +154,39 @@ Acceptance:
 
 ### 9. Expand Regression Coverage From Network Layer To Gameplay Flow
 
-- [ ] Extend [`Assets/Tests/EditMode/Network/MessageManagerTests.cs`](./Assets/Tests/EditMode/Network/MessageManagerTests.cs) only as needed for lane policy regressions
+- [x] Extend [`Assets/Tests/EditMode/Network/MessageManagerTests.cs`](./Assets/Tests/EditMode/Network/MessageManagerTests.cs) only as needed for lane policy regressions
 - [x] Add tests that cover explicit zero-input movement stop behavior
-- [ ] Add tests for client `ShootInput` send routing
+- [x] Add tests for client `ShootInput` send routing
-- [ ] Add tests for `CombatEvent` receive/apply behavior
+- [x] Add tests for `CombatEvent` receive/apply behavior
-- [ ] Add tests for remote `PlayerState` buffering / interpolation decisions where practical
+- [x] Add tests for remote `PlayerState` buffering / interpolation decisions where practical
 - [x] Add tests for server-authoritative movement processing
 - [x] Add tests for server-authoritative shooting/combat result generation
-- [ ] Add at least one end-to-end fake-transport test that covers `MoveInput -> PlayerState` and `ShootInput -> CombatEvent`
+- [x] Add at least one end-to-end fake-transport test that covers `MoveInput -> PlayerState` and `ShootInput -> CombatEvent`
 
 Acceptance:
 
-- [ ] MVP gameplay flow is covered beyond transport-only assertions
+- [x] MVP gameplay flow is covered beyond transport-only assertions
-- [ ] Both client single-session and server multi-session behaviors remain protected
+- [x] Both client single-session and server multi-session behaviors remain protected
-- [ ] Regression tests fail if movement/combat authority accidentally drifts back to the client
+- [x] Regression tests fail if movement/combat authority accidentally drifts back to the client
 
 ### 10. Re-Verify Build And Test
 
-- [ ] Install or use an environment that contains the required .NET runtime for this repository
+- [x] Install or use an environment that contains the required .NET runtime for this repository
-- [ ] Run `dotnet build Network.EditMode.Tests.csproj -v minimal`
+- [x] Run `dotnet build Network.EditMode.Tests.csproj -v minimal`
-- [ ] Run `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`
+- [x] Run `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`
-- [ ] Record the actual result after the environment issue is resolved
+- [x] Record the actual result after the environment issue is resolved
 
 Acceptance:
 
-- [ ] Build succeeds in a runnable local environment
+- [x] Build succeeds in a runnable local environment
-- [ ] Edit-mode network tests succeed
+- [x] Edit-mode network tests succeed
-- [ ] New MVP gameplay regression tests succeed
+- [x] New MVP gameplay regression tests succeed
+
+Recorded result:
+
+- [x] Verified on 2026-03-29 in a local environment with .NET SDK 10.0.201 installed
+- [x] `dotnet build Network.EditMode.Tests.csproj -v minimal` succeeded with 4 non-fatal MSB3277 warning groups about `System.Net.Http` and `System.Security.Cryptography.Algorithms` assembly-version conflicts in Unity dependencies
+- [x] `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` succeeded, covering the edit-mode network and MVP gameplay regression suite
 
 ## Recommended Order
 

openspec/changes/archive/2026-03-29-expand-regression-coverage-from-network-layer-to-gameplay-flow/.openspec.yaml

@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-03-29

openspec/changes/archive/2026-03-29-expand-regression-coverage-from-network-layer-to-gameplay-flow/design.md

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+## Context
+
+The repository already has solid shared-network regression coverage for message typing, lane policy, stale filtering, and recent server-authoritative movement/combat behavior. What remains thin is the gameplay-flow layer that joins client input send paths, client receive/apply paths, remote snapshot decisions, and at least one fake-transport round trip across the server authority loop. The main constraint is to improve confidence without turning edit-mode tests into Unity-scene integration tests or changing shared networking contracts just to satisfy test code.
+
+## Goals / Non-Goals
+
+**Goals:**
+- Add gameplay-flow regression tests that protect the MVP contract from client input through authoritative server outputs and client-side application.
+- Keep low-level routing assertions in focused tests while moving broader gameplay expectations into runtime-level regression fixtures.
+- Reuse existing fake transports, host/runtime entry points, and explicit runtime handles where possible.
+- Introduce only minimal test seams when existing runtime surfaces cannot expose the state needed for stable assertions.
+
+**Non-Goals:**
+- Rework production gameplay architecture beyond what is minimally required for observability in tests.
+- Add Unity play-mode or scene-driven end-to-end automation.
+- Change message definitions, delivery policy rules, or authority ownership as part of this testing change.
+
+## Decisions
+
+### Decision: Keep regression coverage layered instead of expanding `MessageManagerTests`
+`MessageManagerTests` should remain responsible for lane-policy and message-routing invariants only. Gameplay send/receive/application assertions belong in higher-level edit-mode tests that exercise `NetworkManager`, authoritative client state application, interpolation buffers, and server runtime handles together.
+
+Alternative considered: continue adding gameplay assertions into `MessageManagerTests`.
+- Rejected because it would blur transport-policy failures with gameplay-flow failures and make the tests harder to maintain.
+
+### Decision: Prefer existing fake transports and runtime surfaces, add only narrow observability seams
+The test suite should keep using fake transports and explicit runtime handles to drive inputs and inspect outputs. If a client-side flow cannot be asserted without reaching into private state, add a narrow seam such as an inspectable snapshot buffer view or combat-application callback surface rather than introducing Unity-only dependencies into shared code.
+
+Alternative considered: add broad test-only hooks or mock-heavy abstractions around the whole networking layer.
+- Rejected because it would distort the production architecture and create maintenance burden unrelated to MVP behavior.
+
+### Decision: Add one explicit fake-transport gameplay round-trip that spans client and server responsibilities
+Beyond isolated unit-style tests, the suite should include at least one end-to-end fake-transport regression that proves `MoveInput -> PlayerState` and `ShootInput -> CombatEvent` still flow through the MVP authority model. This test should stay deterministic, edit-mode friendly, and limited to the shared/client runtime surfaces already used in the repository.
+
+Alternative considered: rely only on separate client tests and separate server tests.
+- Rejected because it would leave the handoff between client send paths and authoritative server outputs unprotected.
+
+## Risks / Trade-offs
+
+- [Risk] Gameplay-flow tests may become brittle if they assert too many incidental details. → Mitigation: assert stable observable outcomes such as lane choice, accepted state updates, interpolation decisions, and authoritative event types rather than internal call order unless the order is part of the contract.
+- [Risk] End-to-end fake-transport tests may need extra setup and slow the suite. → Mitigation: keep the number of full-flow tests small and reuse focused fixtures/helpers.
+- [Risk] Client observability needs may tempt test-only architecture changes. → Mitigation: require every new seam to be narrow, production-safe, and useful for diagnostics as well as tests.
+
+## Migration Plan
+
+1. Add or extend edit-mode fixtures for client send/receive/application flow and remote snapshot buffering.
+2. Add one deterministic fake-transport end-to-end gameplay test that drives both movement and combat authority.
+3. Leave existing lane-policy tests in place, trimming or extending `MessageManagerTests` only where delivery-policy regressions specifically need coverage.
+4. Update TODO/OpenSpec task tracking after the regression suite protects the MVP gameplay loop.
+
+## Open Questions
+
+- None. The remaining work is implementation detail inside the agreed MVP gameplay surfaces.

openspec/changes/archive/2026-03-29-expand-regression-coverage-from-network-layer-to-gameplay-flow/proposal.md

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+## Why
+
+The MVP networking flow now has concrete client input, client authoritative-state application, remote interpolation, and server-authoritative movement/combat behavior, but regression coverage still skews toward transport and isolated network-layer rules. Step 9 is needed now so future changes cannot silently push gameplay authority, routing, or presentation flow back toward client-side guesswork.
+
+## What Changes
+
+- Add a dedicated gameplay-flow regression coverage capability for edit-mode network tests.
+- Define regression expectations for client `ShootInput` send routing, client `CombatEvent` receive/apply flow, remote `PlayerState` buffering/interpolation decisions, and fake-transport end-to-end gameplay message flow.
+- Keep `MessageManagerTests` focused on lane-policy regressions only, with broader gameplay assertions moving into higher-level flow tests.
+- Require coverage for both client single-session behavior and server multi-session authority paths where the MVP gameplay loop crosses that boundary.
+
+## Capabilities
+
+### New Capabilities
+- `gameplay-flow-regression-coverage`: Define the required regression coverage that protects the MVP gameplay loop from client input through authoritative server state/combat results and client-side application.
+
+### Modified Capabilities
+- None.
+
+## Impact
+
+Affected areas include `Assets/Tests/EditMode/Network/`, lightweight fake-transport/runtime test fixtures, and any minimal runtime/test seams needed to observe client gameplay flow without changing shared networking contracts. This change should not alter production transport policy or MVP message definitions.

openspec/changes/archive/2026-03-29-expand-regression-coverage-from-network-layer-to-gameplay-flow/specs/gameplay-flow-regression-coverage/spec.md

@@ -0,0 +1,31 @@
+## ADDED Requirements
+
+### Requirement: Gameplay-flow regressions cover client gameplay send and receive paths
+The edit-mode regression suite SHALL cover the MVP client gameplay flow above the raw transport router, including `ShootInput` send routing and authoritative `CombatEvent` receive/apply behavior. Lane-policy assertions that belong to `MessageManager` MAY remain in `MessageManagerTests`, but gameplay-flow assertions MUST live in tests that exercise the client runtime or player-facing application path.
+
+#### Scenario: Client fire intent regression proves dedicated `ShootInput` routing
+- **WHEN** the controlled client gameplay path is exercised in an edit-mode regression test for a fire action
+- **THEN** the test observes a `ShootInput` payload sent through the dedicated client shooting path
+- **THEN** any lane-policy assertion in that flow remains limited to confirming the MVP reliable-lane contract rather than replacing broader gameplay-flow coverage
+
+#### Scenario: Authoritative combat event regression proves client-side application
+- **WHEN** an edit-mode regression test delivers an authoritative `CombatEvent` into the client gameplay receive path
+- **THEN** the relevant player-owned authoritative state, presentation model, or diagnostics surface reflects the authoritative hit, damage, death, or rejection result
+- **THEN** the test proves the outcome is applied from server truth rather than speculative local combat logic
+
+### Requirement: Gameplay-flow regressions cover remote authoritative snapshot decisions
+The edit-mode regression suite SHALL cover the client path that buffers and consumes remote authoritative `PlayerState` snapshots, including stale rejection and interpolation/clamp behavior where practical.
+
+#### Scenario: Remote interpolation regression proves buffering and stale rejection
+- **WHEN** an edit-mode regression test feeds ordered and stale remote `PlayerState` snapshots into the client remote-player path
+- **THEN** the test observes that newer authoritative snapshots enter the remote buffer while stale snapshots do not replace newer accepted state
+- **THEN** the test verifies the resulting interpolation or latest-snapshot clamp decision matches the MVP remote-presentation rules
+
+### Requirement: Gameplay-flow regressions include a fake-transport authoritative round trip
+The edit-mode regression suite SHALL include at least one deterministic fake-transport test that spans client send behavior, server-authoritative processing, and outgoing authoritative results. That round-trip regression MUST cover `MoveInput -> PlayerState` and `ShootInput -> CombatEvent` within the same MVP gameplay-flow suite.
+
+#### Scenario: Fake-transport round trip preserves server authority across movement and combat
+- **WHEN** an edit-mode regression test drives gameplay input through fake client/server transports and advances the server authority loop
+- **THEN** the authoritative server path emits `PlayerState` snapshots in response to movement input
+- **THEN** the authoritative server path emits `CombatEvent` results in response to shooting input
+- **THEN** the combined test protects both client single-session input flow and server multi-session authoritative behavior from regression

openspec/changes/archive/2026-03-29-expand-regression-coverage-from-network-layer-to-gameplay-flow/tasks.md

@@ -0,0 +1,17 @@
+## 1. Client Gameplay Flow Coverage
+
+- [x] 1.1 Add or extend edit-mode client tests that prove fire intent sends `ShootInput` through the dedicated gameplay path and only retain `MessageManagerTests` assertions needed for reliable-lane policy regressions.
+- [x] 1.2 Add edit-mode regression tests that deliver authoritative `CombatEvent` messages through the client receive path and verify player-owned authoritative state, presentation, or diagnostics apply hit/damage/death/rejection results from server truth.
+- [x] 1.3 Add any minimal production-safe observability seams needed for the client gameplay tests without introducing Unity dependencies into shared networking code.
+
+## 2. Snapshot And End-To-End Coverage
+
+- [x] 2.1 Add edit-mode regression tests that cover remote `PlayerState` buffering, stale snapshot rejection, and interpolation-versus-clamp decisions where practical.
+- [x] 2.2 Add at least one deterministic fake-transport gameplay-flow test that drives `MoveInput -> PlayerState` through the authoritative server path.
+- [x] 2.3 Extend that fake-transport gameplay-flow coverage to also drive `ShootInput -> CombatEvent` and verify the combined flow protects client single-session input behavior plus server multi-session authority.
+
+## 3. Tracking And Verification
+
+- [x] 3.1 Update `TODO.md` to mark the gameplay-flow regression coverage items completed or narrowed to any remaining follow-up work.
+- [x] 3.2 Keep the new regression suite organized under `Assets/Tests/EditMode/Network/` with names and fixtures that separate lane-policy tests from higher-level gameplay-flow tests.
+- [x] 3.3 Run `dotnet build Network.EditMode.Tests.csproj -v minimal` and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`, then record the actual result in the implementation summary.

openspec/changes/archive/2026-03-29-re-verify-build-and-test/.openspec.yaml

@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-03-29

openspec/changes/archive/2026-03-29-re-verify-build-and-test/design.md

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+## Context
+
+The repository's MVP networking and gameplay-flow work is already implemented and covered by edit-mode tests, but TODO step 10 remains open until the build and test commands are re-run in an environment that actually contains the required .NET runtime. The change is intentionally narrow: it does not introduce new gameplay behavior, only a final verification pass and a recorded outcome in project tracking.
+
+## Goals / Non-Goals
+
+**Goals:**
+- Define a repeatable verification path for the repository's edit-mode build and test commands.
+- Re-run the existing CLI commands in a runnable local environment instead of leaving the result inferred from partial or blocked attempts.
+- Record the actual outcome, including any remaining warnings, in the TODO and change tracking.
+
+**Non-Goals:**
+- Introducing new runtime, gameplay, or transport behavior.
+- Expanding the regression suite beyond what step 9 already added.
+- Solving unrelated SDK or editor installation issues outside what is minimally needed to run the verification commands.
+
+## Decisions
+
+### Decision: Treat this as a verification-only change
+This change stays focused on environment readiness, command execution, and result recording. That keeps the scope aligned with TODO step 10 and avoids reopening already-implemented gameplay work.
+
+Alternative considered: Roll environment fixes and additional code cleanup into the same change. Rejected because it would blur whether a failure came from verification setup or from new functional modifications.
+
+### Decision: Verify the exact documented commands
+The source of truth remains the repository commands already documented in `AGENTS.md` and `TODO.md`:
+- `dotnet build Network.EditMode.Tests.csproj -v minimal`
+- `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`
+
+Alternative considered: Use ad hoc command variants or Unity editor-driven test execution. Rejected because the TODO explicitly calls for these CLI verification steps.
+
+### Decision: Record warnings separately from pass/fail status
+If build and test succeed but still emit known Unity dependency warnings, the recorded result should preserve that nuance instead of flattening everything into a generic success line.
+
+Alternative considered: Ignore warnings once commands pass. Rejected because the TODO asks for the actual result, not a simplified interpretation.
+
+## Risks / Trade-offs
+
+- [Environment drift] -> The runtime available on the current machine may differ from prior attempts. Mitigation: record the actual command outcome from the environment used for this change.
+- [Over-scoping] -> Verification-only work can accidentally turn into general cleanup. Mitigation: limit edits to tracking/docs unless command failures expose a clear regression that must be fixed to complete step 10.
+- [False confidence] -> A successful CLI run does not prove every Unity editor path. Mitigation: keep the scope explicit: this change verifies the documented build/test path, not all editor execution modes.

openspec/changes/archive/2026-03-29-re-verify-build-and-test/proposal.md

@@ -0,0 +1,21 @@
+## Why
+
+The MVP networking work is already implemented, but the TODO still requires a final build-and-test verification in a runnable local environment. This change closes that gap by making the verification step explicit, repeatable, and recorded against the current gameplay regression suite.
+
+## What Changes
+
+- Define a small verification capability for running the repository's edit-mode build and test commands in an environment with the required .NET runtime.
+- Record the actual build and test result for the current MVP networking and gameplay-flow regression suite.
+- Update project tracking so TODO step 10 reflects the completed verification state and any remaining environment caveats.
+
+## Capabilities
+
+### New Capabilities
+- `build-test-verification`: Defines the required local environment assumptions, commands, and recorded result for final MVP build/test verification.
+
+### Modified Capabilities
+- None.
+
+## Impact
+
+Affected areas include OpenSpec tracking under `openspec/`, the root `TODO.md`, and the CLI verification path driven by `dotnet build Network.EditMode.Tests.csproj -v minimal` and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`.

openspec/changes/archive/2026-03-29-re-verify-build-and-test/specs/build-test-verification/spec.md

@@ -0,0 +1,22 @@
+## ADDED Requirements
+
+### Requirement: Runnable CLI verification environment
+The repository SHALL define step 10 completion in terms of a local environment that can execute the documented `dotnet build` and `dotnet test` commands for `Network.EditMode.Tests.csproj` without failing due to a missing required .NET runtime.
+
+#### Scenario: Environment is suitable for verification
+- **WHEN** a maintainer performs the final MVP verification pass
+- **THEN** the environment used for that pass MUST contain the runtime needed to execute the documented CLI build and test commands
+- **AND** the verification record MUST distinguish environment readiness issues from actual build or test failures
+
+### Requirement: Build and test commands are re-run and recorded
+The repository SHALL re-run the documented edit-mode CLI verification commands and record the actual outcome for the current MVP networking codebase.
+
+#### Scenario: Build and test both succeed
+- **WHEN** `dotnet build Network.EditMode.Tests.csproj -v minimal` succeeds and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` succeeds
+- **THEN** project tracking MUST mark the build/test verification step complete
+- **AND** the recorded result MUST state that the edit-mode network test suite passed in the runnable environment
+
+#### Scenario: Verification succeeds with warnings
+- **WHEN** the documented build and test commands succeed but emit non-fatal warnings
+- **THEN** the recorded result MUST preserve the warnings as part of the verification summary
+- **AND** the step MUST still be considered complete because the commands passed

openspec/changes/archive/2026-03-29-re-verify-build-and-test/tasks.md

@@ -0,0 +1,21 @@
+## 1. Verification Environment
+
+- [x] 1.1 Confirm or switch to a local environment that contains the required .NET runtime for `Network.EditMode.Tests.csproj`.
+- [x] 1.2 Re-check the documented verification commands and any required environment variables before execution.
+
+## 2. CLI Verification
+
+- [x] 2.1 Run `dotnet build Network.EditMode.Tests.csproj -v minimal` in the runnable environment.
+- [x] 2.2 Run `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` in the same runnable environment.
+- [x] 2.3 Capture the actual pass/fail outcome and any remaining non-fatal warnings from both commands.
+
+## 3. Tracking Update
+
+- [x] 3.1 Update `TODO.md` step 10 and acceptance items to reflect the real verification result.
+- [x] 3.2 Update this change's implementation tracking with the recorded verification summary so archive-ready state is explicit.
+
+## Verification Summary
+
+- Environment used: local machine with .NET SDK 10.0.201 and the repository's Unity project files available.
+- `dotnet build Network.EditMode.Tests.csproj -v minimal`: succeeded with 4 non-fatal MSB3277 warning groups related to `System.Net.Http` and `System.Security.Cryptography.Algorithms` Unity dependency conflicts.
+- `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal`: succeeded for the edit-mode network and MVP gameplay regression suite.

openspec/specs/build-test-verification/spec.md

@@ -0,0 +1,28 @@
+# build-test-verification Specification
+
+## Purpose
+
+Define the runnable local environment and recorded CLI verification result required to close the final MVP build/test verification step.
+
+## Requirements
+
+### Requirement: Runnable CLI verification environment
+The repository SHALL define step 10 completion in terms of a local environment that can execute the documented `dotnet build` and `dotnet test` commands for `Network.EditMode.Tests.csproj` without failing due to a missing required .NET runtime.
+
+#### Scenario: Environment is suitable for verification
+- **WHEN** a maintainer performs the final MVP verification pass
+- **THEN** the environment used for that pass MUST contain the runtime needed to execute the documented CLI build and test commands
+- **AND** the verification record MUST distinguish environment readiness issues from actual build or test failures
+
+### Requirement: Build and test commands are re-run and recorded
+The repository SHALL re-run the documented edit-mode CLI verification commands and record the actual outcome for the current MVP networking codebase.
+
+#### Scenario: Build and test both succeed
+- **WHEN** `dotnet build Network.EditMode.Tests.csproj -v minimal` succeeds and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` succeeds
+- **THEN** project tracking MUST mark the build/test verification step complete
+- **AND** the recorded result MUST state that the edit-mode network test suite passed in the runnable environment
+
+#### Scenario: Verification succeeds with warnings
+- **WHEN** the documented build and test commands succeed but emit non-fatal warnings
+- **THEN** the recorded result MUST preserve the warnings as part of the verification summary
+- **AND** the step MUST still be considered complete because the commands passed

openspec/specs/gameplay-flow-regression-coverage/spec.md

@@ -0,0 +1,35 @@
+# gameplay-flow-regression-coverage Specification
+
+## Purpose
+Define the required edit-mode regression coverage that protects the MVP gameplay flow from client gameplay input through authoritative server outputs and client-side application.
+
+## Requirements
+### Requirement: Gameplay-flow regressions cover client gameplay send and receive paths
+The edit-mode regression suite SHALL cover the MVP client gameplay flow above the raw transport router, including `ShootInput` send routing and authoritative `CombatEvent` receive/apply behavior. Lane-policy assertions that belong to `MessageManager` MAY remain in `MessageManagerTests`, but gameplay-flow assertions MUST live in tests that exercise the client runtime or player-facing application path.
+
+#### Scenario: Client fire intent regression proves dedicated `ShootInput` routing
+- **WHEN** the controlled client gameplay path is exercised in an edit-mode regression test for a fire action
+- **THEN** the test observes a `ShootInput` payload sent through the dedicated client shooting path
+- **THEN** any lane-policy assertion in that flow remains limited to confirming the MVP reliable-lane contract rather than replacing broader gameplay-flow coverage
+
+#### Scenario: Authoritative combat event regression proves client-side application
+- **WHEN** an edit-mode regression test delivers an authoritative `CombatEvent` into the client gameplay receive path
+- **THEN** the relevant player-owned authoritative state, presentation model, or diagnostics surface reflects the authoritative hit, damage, death, or rejection result
+- **THEN** the test proves the outcome is applied from server truth rather than speculative local combat logic
+
+### Requirement: Gameplay-flow regressions cover remote authoritative snapshot decisions
+The edit-mode regression suite SHALL cover the client path that buffers and consumes remote authoritative `PlayerState` snapshots, including stale rejection and interpolation/clamp behavior where practical.
+
+#### Scenario: Remote interpolation regression proves buffering and stale rejection
+- **WHEN** an edit-mode regression test feeds ordered and stale remote `PlayerState` snapshots into the client remote-player path
+- **THEN** the test observes that newer authoritative snapshots enter the remote buffer while stale snapshots do not replace newer accepted state
+- **THEN** the test verifies the resulting interpolation or latest-snapshot clamp decision matches the MVP remote-presentation rules
+
+### Requirement: Gameplay-flow regressions include a fake-transport authoritative round trip
+The edit-mode regression suite SHALL include at least one deterministic fake-transport test that spans client send behavior, server-authoritative processing, and outgoing authoritative results. That round-trip regression MUST cover `MoveInput -> PlayerState` and `ShootInput -> CombatEvent` within the same MVP gameplay-flow suite.
+
+#### Scenario: Fake-transport round trip preserves server authority across movement and combat
+- **WHEN** an edit-mode regression test drives gameplay input through fake client/server transports and advances the server authority loop
+- **THEN** the authoritative server path emits `PlayerState` snapshots in response to movement input
+- **THEN** the authoritative server path emits `CombatEvent` results in response to shooting input
+- **THEN** the combined test protects both client single-session input flow and server multi-session authoritative behavior from regression