feat(entities): derivar collision_radius del shape + scale/collision_factor al YAML

source/game/entities/enemy.cpp

@@ -55,22 +55,24 @@ void Enemy::init(EnemyType type, const Vec2* ship_pos) {
     config_ = &EnemyRegistry::get(type);
     const EnemyConfig& cfg = *config_;
 
-    collision_radius_ = cfg.physics.collision_radius;
-
     // Cas Square: resetejar tracking timer al spawn.
     if (type_ == EnemyType::SQUARE) {
         tracking_timer_ = 0.0F;
         tracking_strength_ = cfg.behavior.tracking_strength;
     }
 
-    body_.setMass(cfg.physics.mass);
-    body_.radius = collision_radius_;
-
     shape_ = Graphics::ShapeLoader::load(cfg.shape.path);
     if (!shape_ || !shape_->isValid()) {
         std::cerr << "[Enemy] Error: no se ha podido cargar " << cfg.shape.path << '\n';
     }
 
+    // Radi de col·lisió derivat del cercle circumscrit de la shape * scale * collision_factor.
+    const float BOUNDING = (shape_ != nullptr) ? shape_->getBoundingRadius() : 0.0F;
+    collision_radius_ = BOUNDING * cfg.shape.scale * cfg.shape.collision_factor;
+
+    body_.setMass(cfg.physics.mass);
+    body_.radius = collision_radius_;
+
     // Posición aleatoria con comprobación de seguridad
     float min_x;
     float max_x;
@@ -188,7 +190,8 @@ void Enemy::draw() const {
     if (!is_active_ || !shape_) {
         return;
     }
-    const float SCALE = computeCurrentScale();
+    // El SCALE final = escala base del YAML * modulador dinàmic (spawn/pulse).
+    const float SCALE = config_->shape.scale * computeCurrentScale();
     SDL_Color color = config_->colors.normal;
 
     // Parpadeo dorado mientras está herido.