Add event publishing for inventory and combat interactions

GameCore/Events/EntityDamagedEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct EntityDamagedEvent(Entity target, float newHealth, float damageTaken) : IEvent
+{
+    public readonly Entity Target = target;
+    public readonly float NewHealth = newHealth;
+    public readonly float DamageTaken = damageTaken;
+}

GameCore/Events/HitscanImpactEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+using GameCore.Math;
+
+namespace GameCore.Events;
+
+public readonly struct HitscanImpactEvent(Entity owner, Vector3 from, Vector3 to, HitResult hit) : IEvent
+{
+    public readonly Entity Owner = owner;
+    public readonly Vector3 From = from;
+    public readonly Vector3 To = to;
+    public readonly HitResult Hit = hit;
+}

GameCore/Events/InstantItemUsedEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct InstantItemUsedEvent(Entity picker, string itemId) : IEvent
+{
+    public readonly Entity Picker = picker;
+    public readonly string ItemId = itemId;
+}

GameCore/Events/InventoryItemChangedEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct InventoryItemChangedEvent(Entity owner, string itemId, int newQuantity) : IEvent
+{
+    public readonly Entity Owner = owner;
+    public readonly string ItemId = itemId;
+    public readonly int NewQuantity = newQuantity;
+}

GameCore/Events/ProjectileImpactEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct ProjectileImpactEvent(Entity projectile, HitResult hit) : IEvent
+{
+    public readonly Entity ProjectileEntity = projectile;
+    public readonly HitResult Hit = hit;
+}

GameCore/Events/WeaponEquippedEvent.cs

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+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct WeaponEquippedEvent(Entity owner, string newWeaponItemId) : IEvent
+{
+    public readonly Entity Owner = owner;
+    public readonly string NewWeaponItemId = newWeaponItemId;
+}