Esquelet inicial: finestra negra i primera escena

source/core/scene/scene.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <memory>
+
+class Scene {
+   public:
+    virtual ~Scene() = default;
+
+    virtual void update(int delta_ms) = 0;
+    virtual void render() = 0;
+
+    [[nodiscard]] auto wantsQuit() const -> bool { return wants_quit_; }
+    [[nodiscard]] auto nextScene() -> std::unique_ptr<Scene> { return std::move(next_scene_); }
+
+   protected:
+    bool wants_quit_{false};
+    std::unique_ptr<Scene> next_scene_;
+};