feat(title): FSM IDLE/STARTING amb START per jugador i propagació de StartingPlayers

source/core/system/director.cpp

@@ -251,19 +251,18 @@ Director::Director() {
     std::cout << "Director: start_scene=" << DebugConfig::toString(START)
               << " starting_players=" << DebugConfig::toString(STARTING_PLAYERS) << '\n';
 
-    // El branch Release inicialitza STARTING_PLAYERS amb una constant
-    // literal i clang considera la captura redundant; en Debug el valor és
-    // runtime i la captura sí és imprescindible. La lambda viu dins de
-    // IntroScene, més enllà del scope d'aquest ctor — capturar per
-    // referència seria UB.
-    // NOLINTNEXTLINE(clang-diagnostic-unused-lambda-capture)
-    auto make_game = [STARTING_PLAYERS]() -> std::unique_ptr<Scene> {
+    // `make_game` i `make_intro` reben `StartingPlayers` com a paràmetre
+    // perquè la TitleScene tria al moment quins jugadors entren (P1, P2,
+    // BOTH) segons la pulsació. La IntroScene ho reenvia a la GameScene.
+    // El valor de `STARTING_PLAYERS` només s'usa com a punt d'entrada en
+    // mode Debug quan saltem directament a INTRO o GAME (saltant TITLE).
+    auto make_game = [](DebugConfig::StartingPlayers players) -> std::unique_ptr<Scene> {
         auto cfg = GameScene::defaultConfig();
-        cfg.starting_players = STARTING_PLAYERS;
+        cfg.starting_players = players;
         return std::make_unique<GameScene>(std::move(cfg));
     };
-    auto make_intro = [placeholder_text, make_game]() -> std::unique_ptr<Scene> {
-        return std::make_unique<IntroScene>(placeholder_text, make_game);
+    auto make_intro = [placeholder_text, make_game](DebugConfig::StartingPlayers players) -> std::unique_ptr<Scene> {
+        return std::make_unique<IntroScene>(placeholder_text, players, make_game);
     };
     auto make_title = [menu_title_text, placeholder_text, title_bg_surface, mini_logo_surface, make_intro]() -> std::unique_ptr<Scene> {
         return std::make_unique<TitleScene>(menu_title_text, placeholder_text, title_bg_surface, mini_logo_surface, make_intro);
@@ -277,10 +276,10 @@ Director::Director() {
             current_scene_ = make_title();
             break;
         case DebugConfig::StartScene::INTRO:
-            current_scene_ = make_intro();
+            current_scene_ = make_intro(STARTING_PLAYERS);
             break;
         case DebugConfig::StartScene::GAME:
-            current_scene_ = make_game();
+            current_scene_ = make_game(STARTING_PLAYERS);
             break;
     }
     last_ticks_ms_ = SDL_GetTicks();