tune(stages): netejar comentaris obsolets a processPlaying

source/game/stage_system/stage_manager.cpp

@@ -127,11 +127,10 @@ namespace StageSystem {
     }
 
     void StageManager::processPlaying(float delta_time, bool pause_spawn) {
-        // Update spawn controller (pauses when pause_spawn = true)
-        // Note: The actual enemy array update happens in GameScene::update()
-        // This is just for internal timekeeping
-        (void)delta_time;   // Spawn controller is updated externally
-        (void)pause_spawn;  // Es propaga al WaveRunner des de GameScene
+        // No-op: el WaveRunner s'actualitza des de GameScene::runStagePlaying,
+        // no des d'ací. La signatura es manté per simetria amb les altres process*.
+        (void)delta_time;
+        (void)pause_spawn;
     }
 
     void StageManager::processLevelCompleted(float delta_time) {