feat(demo): demos a 1 i 2 jugadors, esquiva de bales enemigues i vides infinites

source/game/scenes/title_scene.cpp

@@ -20,6 +20,7 @@
 #include "core/rendering/shape_renderer.hpp"
 #include "core/system/scene_context.hpp"
 #include "core/system/service_menu.hpp"
+#include "game/systems/demo_pilot.hpp"
 #include "project.h"
 
 using SceneManager::SceneContext;
@@ -359,9 +360,12 @@ void TitleScene::update(float delta_time) {
             idle_timer_ += delta_time;
         }
         if (idle_timer_ >= TITLE_DEMO_TIMEOUT) {
+            // L'escenari curat (mateix índex que llegirà GameScene) decideix
+            // quants jugadors IA hi ha. No avancem l'índex ací: ho fa GameScene.
+            const Systems::Demo::Scenario SC = Systems::Demo::scenario(context_.demoScenarioIndex());
             GameConfig::MatchConfig demo_cfg;
             demo_cfg.player1_active = true;
-            demo_cfg.player2_active = false;
+            demo_cfg.player2_active = (SC.players >= 2);
             demo_cfg.mode = GameConfig::Mode::DEMO;
             context_.setMatchConfig(demo_cfg);
             context_.setNextScene(SceneType::GAME);