refactor: replace boxed component addition with typed delegate

src/OECS.SourceGen/ComponentDiscoveryGenerator.cs

@@ -211,7 +211,8 @@ public class ComponentDiscoveryGenerator : IIncrementalGenerator
             sb.AppendLine($"                    typeName: \"{aqn}\",");
             sb.AppendLine($"                    type: typeof({fqn}),");
             sb.AppendLine($"                    serialize: obj => MessagePackSerializer.Serialize(({fqn})obj),");
-            sb.AppendLine($"                    deserialize: data => MessagePackSerializer.Deserialize<{fqn}>(data)");
+            sb.AppendLine($"                    deserializeAndAdd: (world, entity, data) =>");
+            sb.AppendLine($"                        world.AddComponent(entity, MessagePackSerializer.Deserialize<{fqn}>(data))");
             sb.Append("                )");
         }
 

src/OECS/ComponentDescriptor.cs

@@ -23,19 +23,20 @@ public sealed class ComponentDescriptor
     public Func<object, byte[]> Serialize { get; }
 
     /// <summary>
-    /// Deserializes a MessagePack byte array into a boxed component instance.
+    /// Deserializes a MessagePack byte array and adds the component to the entity
+    /// via the typed <see cref="World.AddComponent{T}"/> method. No reflection.
     /// </summary>
-    public Func<byte[], object> Deserialize { get; }
+    public Action<World, Entity, byte[]> DeserializeAndAdd { get; }
 
     public ComponentDescriptor(
         string typeName,
         Type type,
         Func<object, byte[]> serialize,
-        Func<byte[], object> deserialize)
+        Action<World, Entity, byte[]> deserializeAndAdd)
     {
         TypeName = typeName;
         Type = type;
         Serialize = serialize;
-        Deserialize = deserialize;
+        DeserializeAndAdd = deserializeAndAdd;
     }
 }

src/OECS/World.cs

@@ -1,5 +1,4 @@
 using System.Diagnostics;
-using System.Reflection;
 using R3;
 
 namespace OECS;
@@ -665,27 +664,6 @@ public class World : IDisposable
     /// </summary>
     internal ComponentStore Components => _components;
 
-    /// <summary>
-    /// Adds a boxed component to an entity by its runtime type.
-    /// Used by <see cref="WorldSerializer"/> during deserialization to
-    /// invoke the typed <see cref="AddComponent{T}"/> without reflection.
-    /// </summary>
-    internal void AddComponentBoxed(Type componentType, Entity entity, object component)
-    {
-        // Use a cached delegate per type to avoid reflection on every call.
-        if (!_addComponentDelegates.TryGetValue(componentType, out var del))
-        {
-            var method = typeof(World).GetMethod(nameof(AddComponent))!
-                .MakeGenericMethod(componentType);
-            del = (Action<World, Entity, object>)Delegate.CreateDelegate(
-                typeof(Action<World, Entity, object>), method);
-            _addComponentDelegates[componentType] = del;
-        }
-        del(this, entity, component);
-    }
-
-    private readonly Dictionary<Type, Action<World, Entity, object>> _addComponentDelegates = new();
-
     // ── Helpers ───────────────────────────────────────────────────────
 
     private void ThrowIfNotAlive(Entity entity)

src/OECS/WorldSerializer.cs

@@ -93,12 +93,8 @@ public static class WorldSerializer
                         $"Ensure the component type is used with the World " +
                         $"API so the source generator can discover it.");
 
-                var component = desc.Deserialize(ce.Data)
+                // Deserialize and add in one typed operation — no reflection.
-                    ?? throw new InvalidOperationException(
+                desc.DeserializeAndAdd(world, entity, ce.Data);
-                        $"Failed to deserialize component of type '{ce.TypeName}'.");
-
-                // Use the generated typed delegate to add the component.
-                world.AddComponentBoxed(desc.Type, entity, component);
             }
         }
     }