Add initial game systems and input handling for player interactions

Assets/Scripts/Core/GameEvents.cs

@@ -0,0 +1,36 @@
+using System;
+
+namespace Core
+{
+    public static class GameEvents
+    {
+        // Gameplay Events (Inputs to the systems)
+        public static event Action<int> PresentCaught; 
+        public static event Action PresentDropped; 
+        
+        // State Changes (Outputs from the systems)
+        public static event Action<int> ScoreUpdated;
+        public static event Action<int> LivesUpdated;
+        public static event Action<float> TimeUpdated;
+        public static event Action GameOver;
+
+        // Invokers
+        public static void ReportPresentCaught(int value) => PresentCaught?.Invoke(value);
+        public static void ReportPresentDropped() => PresentDropped?.Invoke();
+        public static void ReportScoreUpdated(int score) => ScoreUpdated?.Invoke(score);
+        public static void ReportLivesUpdated(int lives) => LivesUpdated?.Invoke(lives);
+        public static void ReportTimeUpdated(float time) => TimeUpdated?.Invoke(time);
+        public static void ReportGameOver() => GameOver?.Invoke();
+
+        public static void Clear()
+        {
+            // Reset events when scene reloads to prevent memory leaks
+            PresentCaught = null;
+            PresentDropped = null;
+            ScoreUpdated = null;
+            LivesUpdated = null;
+            TimeUpdated = null;
+            GameOver = null;
+        }
+    }
+}