Knockback tag implementation

src/items/thrown/ThrownItem.cs

@@ -0,0 +1,36 @@
+using Chickensoft.AutoInject;
+using Chickensoft.Introspection;
+using GameJamDungeon;
+using Godot;
+
+[Meta(typeof(IAutoNode))]
+public partial class ThrownItem : RigidBody3D
+{
+  public override void _Notification(int what) => this.Notify(what);
+
+  [Dependency] public IGame Game => this.DependOn<IGame>();
+
+  [Node] public Sprite2D Sprite { get; set; } = default!;
+
+  private int _damage = 0;
+
+  public void OnResolved()
+  {
+    BodyEntered += ThrownItem_BodyEntered;
+    GlobalPosition = Game.Player.GlobalPosition + Vector3.Up;
+    AddCollisionExceptionWith((Node)Game.Player);
+  }
+
+  private void ThrownItem_BodyEntered(Node body)
+  {
+    if (body is IEnemy enemy)
+      enemy.EnemyLogic.Input(new EnemyLogic.Input.HitByPlayer(_damage));
+    QueueFree();
+  }
+
+  public void Throw(ThrowableItemStats throwableItemStats)
+  {
+    _damage = throwableItemStats.Damage;
+    ApplyCentralImpulse(Game.Player.GlobalBasis.Z.Normalized() * -20.0f);
+  }
+}