Add ammo consumption and item pickup systems

GameCore/Inventory/PickupSystem.cs

@@ -1,4 +1,3 @@
-using GameCore.Combat;
 using GameCore.ECS;
 using GameCore.ECS.Interfaces;
 using GameCore.Events;
@@ -20,15 +19,17 @@ public class PickupSystem : ISystem
             var collision = world.GetComponent<CollisionEventComponent>(entity);
             if (collision == null) continue;
 
-            var pickup = world.GetComponent<PickupComponent>(entity);
+            var pickup = world.GetComponent<PickupComponent>(collision.OtherEntity);
             var inventory = world.GetComponent<InventoryComponent>(entity);
 
             if (pickup == null || inventory == null) continue;
 
-            var item = new Item(pickup.ItemId, pickup.Quantity);
-            // In the future, handle IsInstantUse items here
-            world.PublishEvent(new AddItemToInventoryEvent(entity, item));
-            world.AddComponent(collision.OtherEntity, new DeathComponent());
+            world.PublishEvent(new ItemPickupAttemptEvent(
+                entity,
+                collision.OtherEntity,
+                pickup.ItemId,
+                pickup.Quantity
+            ));
         }
 
         foreach (var entity in withCollisions) world.RemoveComponent<CollisionEventComponent>(entity);