feat: Implement a comprehensive global event bus with new event handlers and integrate player health and collection events.

scripts/Events/ScoreEventHandler.cs

@@ -0,0 +1,34 @@
+using Godot;
+using Mr.BrickAdventures;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles coin collection events and updates the session state.
+/// Replaces the manual signal wiring in ScoreComponent.
+/// </summary>
+public partial class ScoreEventHandler : Node
+{
+    private GameManager _gameManager;
+
+    public override void _Ready()
+    {
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
+
+        EventBus.Instance.CoinCollected += OnCoinCollected;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+            EventBus.Instance.CoinCollected -= OnCoinCollected;
+    }
+
+    private void OnCoinCollected(int amount, Vector2 position)
+    {
+        var currentCoins = (int)_gameManager.CurrentSessionState["coins_collected"];
+        _gameManager.CurrentSessionState["coins_collected"] = currentCoins + amount;
+        GD.Print($"ScoreEventHandler: Collected {amount} coins. Total session coins: {currentCoins + amount}");
+    }
+}