Overhaul game state logic to support gameplay loop

Zennysoft.Game.Ma.Implementation/Game/state/gamestates/GameState.State.InventoryScreen..cs

@@ -0,0 +1,20 @@
+using Chickensoft.Introspection;
+using Chickensoft.LogicBlocks;
+
+namespace Zennysoft.Ma.Adapter;
+
+public partial class GameState
+{
+  public partial record State
+  {
+    [Meta, LogicBlock(typeof(State), Diagram = true)]
+    public partial record InventoryScreen : State, IGet<Input.InventoryButtonPressed>
+    {
+      public Transition On(in Input.InventoryButtonPressed input)
+      {
+        Output(new Output.CloseInventoryMenu());
+        return To<InGame>();
+      }
+    }
+  }
+}