basic capture functionality

scripts/world/Creature.cs

@@ -0,0 +1,20 @@
+using Godot;
+
+public partial class Creature : Area2D
+{
+	[Export] public string CreatureId { get; set; } = "creature:ember_fox";
+	public bool IsCaptured { get; private set; } = false;
+
+	public override void _Ready()
+	{
+		// Make sure we receive overlap events
+		Monitoring = true;
+		Monitorable = true;
+	}
+
+	public void Despawn()
+	{
+		IsCaptured = true;
+		QueueFree();
+	}
+}