Lot final: doble clamp de riesgo + margen

double ProposedLot(string symbol, ENUM_ORDER_TYPE type,
                   double riskMoney, double slPoints, double maxMarginPct)
{
   double byRisk = LotForRisk(symbol, riskMoney, slPoints);

   double budget   = AccountInfoDouble(ACCOUNT_MARGIN_FREE) * maxMarginPct / 100.0;
   double byMargin = MaxLotByMargin(symbol, type, budget);

   double lot = MathMin(byRisk, byMargin);
   if(lot < SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN))
   {
      PrintFormat("Lot %.2f sous le minimum : trade impossible avec ce budget", lot);
      return 0.0; // refuser plutôt que forcer le lot minimum (risque dépassé)
   }
   PrintFormat("Lot proposé %.2f (risque %.2f / marge %.2f)", lot, byRisk, byMargin);
   return lot;
}