refactor(enemies): renombrar big_pentagon a orb i enemy_big_orb a enemy_orb

source/game/entities/enemy_config.cpp

@@ -30,7 +30,7 @@ namespace {
         if (s == "square") { return EnemyType::SQUARE; }
         if (s == "pinwheel") { return EnemyType::PINWHEEL; }
         if (s == "star") { return EnemyType::STAR; }
-        if (s == "big_pentagon") { return EnemyType::BIG_PENTAGON; }
+        if (s == "orb") { return EnemyType::ORB; }
         return std::nullopt;
     }
 
@@ -353,8 +353,8 @@ namespace {
                 out.movement.rotation_proximity_multiplier = legacy.rotation_proximity_multiplier;
                 out.movement.proximity_distance = legacy.proximity_distance;
                 break;
-            case EnemyType::BIG_PENTAGON:
-                // Sense legacy fallback: el YAML del big_pentagon ha de definir
+            case EnemyType::ORB:
+                // Sense legacy fallback: el YAML de l'orb ha de definir
                 // ai.movement explícitament. Default chase lent perquè el switch
                 // siga exhaustiu i no falli si algú omet el bloc ai.
                 out.movement.type = MovementType::CHASE;