Esquelet inicial: finestra negra i primera escena

source/core/system/director.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+
+#include <cstdint>
+#include <memory>
+
+class Scene;
+
+class Director {
+   public:
+    Director();
+    ~Director();
+
+    auto iterate() -> SDL_AppResult;
+
+   private:
+    std::unique_ptr<Scene> current_scene_;
+    std::uint64_t last_ticks_ms_{0};
+
+    void processEvents();
+    void switchSceneIfRequested();
+};