step 3: menu_scene substituix doMenu() + fix JI_Update al fiber loop

source/core/system/director.cpp

@@ -21,6 +21,7 @@
 #include "game/modulesequence.hpp"
 #include "game/options.hpp"
 #include "scenes/banner_scene.hpp"
+#include "scenes/menu_scene.hpp"
 #include "scenes/mort_scene.hpp"
 #include "scenes/scene.hpp"
 #include "scenes/scene_registry.hpp"
@@ -63,6 +64,7 @@ void gameFiberEntry() {
                 scene->onEnter();
                 Uint32 last = SDL_GetTicks();
                 while (!scene->done() && !JG_Quitting()) {
+                    JI_Update();  // refresca key_pressed/any_key per a les escenes
                     const Uint32 now = SDL_GetTicks();
                     scene->tick(static_cast<int>(now - last));
                     last = now;
@@ -102,6 +104,7 @@ void Director::init() {
     // caient, el fallback al switch legacy de gameFiberEntry deixa de
     // rebre aquests states.
     auto& registry = scenes::SceneRegistry::instance();
+    registry.registerScene(0, [] { return std::make_unique<scenes::MenuScene>(); });
     registry.registerScene(100, [] { return std::make_unique<scenes::MortScene>(); });
     // BannerScene cobreix les piràmides 2..5 (el vell doBanner decideix
     // pel switch intern llegint info::ctx.num_piramide).