Update Project

Assets/Scripts/Core/IGameStateManager.cs

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+namespace FlappyBird.Core
+{
+    /// <summary>
+    /// Contract for the central game-state service.
+    /// Matches the interface defined in AI_RULES.md.
+    /// </summary>
+    public interface IGameStateManager
+    {
+        /// <summary>The currently active game state.</summary>
+        GameState CurrentState { get; }
+        /// <summary>
+        /// Transitions to <paramref name="newState"/>.
+        /// Fires <see cref="OnStateChanged"/> after the transition completes.
+        /// </summary>
+        void ChangeState(GameState newState);
+        /// <summary>
+        /// Fired every time the game state changes.
+        /// Passes the new <see cref="GameState"/> value.
+        /// </summary>
+        event System.Action<GameState> OnStateChanged;
+    }
+}