Add event publishing for inventory and combat interactions

GameCore/Combat/DamageSystem.cs

@@ -34,5 +34,8 @@ public class DamageSystem : ISystem
     {
         var targetAttributes = _world.GetComponent<AttributeComponent>(e.Target);
         targetAttributes?.ModifyValue(Attribute.Health, -e.Amount);
+
+        var newHealth = targetAttributes?.GetValue(Attribute.Health) ?? 0f;
+        _world.PublishEvent(new EntityDamagedEvent(e.Target, newHealth, e.Amount));
     }
 }