perf(eventbus): remove inline allocations and expose binding snapshots

Runtime/EventBus.cs

@@ -143,6 +143,14 @@ namespace ShrinkEventBus
             return generated.AttachGenerated(Resolver, defaultBus ?? ShrinkBusKey.Game);
         }
 
+        public static IReadOnlyList<(Type EventType, System.Reflection.MethodInfo Handler)> CaptureBindings(IShrinkEventBus bus)
+        {
+            if (bus is ShrinkEventBusInstance instance) return instance.CaptureBindings();
+            throw new NotSupportedException("This event bus does not expose binding diagnostics.");
+        }
+
+        public static IReadOnlyList<IShrinkEventBus> CaptureNamedBuses() => new List<IShrinkEventBus>(Buses.Values);
+
         internal static IReadOnlyList<(ShrinkBusKey Key, ShrinkBusOptions Options, int Subscribers)> Snapshot()
         {
             var snapshot = new List<(ShrinkBusKey, ShrinkBusOptions, int)>(Buses.Count);

Runtime/ShrinkEventBusCore.cs

@@ -14,6 +14,7 @@ namespace ShrinkEventBus
     internal interface IShrinkEventChannel
     {
         int Count { get; }
+        void CaptureBindings(List<(Type EventType, System.Reflection.MethodInfo Handler)> bindings);
         bool RemoveSubscription(long subscriptionId);
         void Clear();
         void DetachSlot(int slot);
@@ -87,6 +88,15 @@ namespace ShrinkEventBus
         private Action<TEvent>? _syncDispatcher;
 
         public int Count => _snapshot.Length;
+        public void CaptureBindings(List<(Type EventType, System.Reflection.MethodInfo Handler)> bindings)
+        {
+            var snapshot = _snapshot;
+            foreach (var entry in snapshot)
+            {
+                var method = entry.SyncHandler?.Method ?? entry.AsyncHandler?.Method;
+                if (method != null) bindings.Add((typeof(TEvent), method));
+            }
+        }
 
         public void Add(long subscriptionId, long registrationOrder, Action<TEvent> handler,
             ShrinkSubscribeDescriptor descriptor)

Runtime/ShrinkEventBusInstance.cs

@@ -75,7 +75,7 @@ namespace ShrinkEventBus
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public virtual ShrinkPostResult Post<TEvent>(in TEvent eventData) where TEvent : IShrinkEvent
         {
-            if (eventData is null)
+            if (!typeof(TEvent).IsValueType && eventData is null)
                 throw new ArgumentNullException(nameof(eventData));
             if (Volatile.Read(ref _disposed) != 0)
                 return TraceWithoutDispatch(in eventData,
@@ -84,6 +84,11 @@ namespace ShrinkEventBus
             if (_isInline || _scheduler.IsOnSchedulerThread)
                 return Dispatch(in eventData);
 
+            return PostScheduled(in eventData);
+        }
+
+        private ShrinkPostResult PostScheduled<TEvent>(in TEvent eventData) where TEvent : IShrinkEvent
+        {
             var queuedEvent = eventData;
             if (_scheduler.TryPost(() => Dispatch(in queuedEvent)))
                 return new ShrinkPostResult(true, false, false);
@@ -94,7 +99,7 @@ namespace ShrinkEventBus
         public virtual UniTask<ShrinkPostResult> PostAsync<TEvent>(TEvent eventData,
             CancellationToken cancellationToken = default) where TEvent : IShrinkEvent
         {
-            if (eventData is null)
+            if (!typeof(TEvent).IsValueType && eventData is null)
                 throw new ArgumentNullException(nameof(eventData));
             if (Volatile.Read(ref _disposed) != 0)
                 return UniTask.FromResult(TraceWithoutDispatch(in eventData,
@@ -168,6 +173,13 @@ namespace ShrinkEventBus
             return new EventSubscription(this, subscriptionId);
         }
 
+        internal IReadOnlyList<(Type EventType, System.Reflection.MethodInfo Handler)> CaptureBindings()
+        {
+            var bindings = new List<(Type, System.Reflection.MethodInfo)>();
+            lock (_channelGate) foreach (var channel in _channels.Values) channel.CaptureBindings(bindings);
+            return bindings;
+        }
+
         internal int SubscriberCount
         {
             get
@@ -367,7 +379,7 @@ namespace ShrinkEventBus
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public override ShrinkPostResult Post<TEvent>(in TEvent eventData)
         {
-            if (eventData is null)
+            if (!typeof(TEvent).IsValueType && eventData is null)
                 throw new ArgumentNullException(nameof(eventData));
             if (IsDisposed)
                 return TraceWithoutDispatch(in eventData,
@@ -378,7 +390,7 @@ namespace ShrinkEventBus
         public override UniTask<ShrinkPostResult> PostAsync<TEvent>(TEvent eventData,
             CancellationToken cancellationToken = default)
         {
-            if (eventData is null)
+            if (!typeof(TEvent).IsValueType && eventData is null)
                 throw new ArgumentNullException(nameof(eventData));
             if (IsDisposed)
                 return UniTask.FromResult(TraceWithoutDispatch(in eventData,