Overhaul game state logic to support gameplay loop

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

@@ -0,0 +1,33 @@
+using Chickensoft.Introspection;
+using Chickensoft.LogicBlocks;
+using Zennysoft.Game.Abstractions;
+
+namespace Zennysoft.Ma.Adapter;
+
+public partial class GameState
+{
+  public partial record State
+  {
+    [Meta, LogicBlock(typeof(State), Diagram = true)]
+    public partial record MainMenu : State, IGet<Input.NewGame>, IGet<Input.ContinueGame>, IGet<Input.LoadGame>
+    {
+      public Transition On(in Input.NewGame input)
+      {
+        Output(new Output.InitializeGame());
+        return To<InGame>();
+      }
+
+      public Transition On(in Input.ContinueGame input)
+      {
+        Output(new Output.InitializeGame());
+        return To<InGame>();
+      }
+
+      public Transition On(in Input.LoadGame input)
+      {
+        Output(new Output.LoadGameFromFile());
+        return To<InGame>();
+      }
+    }
+  }
+}