feat: Implement a skill pickup system with a new collectable type, event handling, and dedicated pickup objects.

scripts/Events/SkillCollectHandler.cs

@@ -0,0 +1,44 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles skill collection events and unlocks skills via GameStateStore.
+/// Skills are immediately activated but only persisted on level complete.
+/// </summary>
+public partial class SkillCollectHandler : Node
+{
+    private SkillManager _skillManager;
+
+    public override void _Ready()
+    {
+        _skillManager = GetNode<SkillManager>(Constants.SkillManagerPath);
+        EventBus.Instance.SkillCollected += OnSkillCollected;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.SkillCollected -= OnSkillCollected;
+        }
+    }
+
+    private void OnSkillCollected(SkillData skill, Vector2 position)
+    {
+        if (skill == null) return;
+
+        // Unlock in session (will be committed on level complete, lost on death)
+        GameStateStore.Instance?.UnlockSkillInSession(skill);
+
+        // Immediately activate the skill for the player
+        skill.IsActive = true;
+        skill.Level = 1;
+        _skillManager?.AddSkill(skill);
+
+        // Emit skill unlocked event for UI/achievements
+        EventBus.EmitSkillUnlocked(skill.Name, skill.Level);
+    }
+}