Esquelet inicial: finestra negra i primera escena

source/game/scenes/black_scene.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "core/scene/scene.hpp"
+
+class BlackScene : public Scene {
+   public:
+    BlackScene();
+
+    void update(int delta_ms) override;
+    void render() override;
+
+   private:
+    int elapsed_ms_{0};
+};