def check_stop_loss_positions(self, risk_manager) -> List[str]:
        """
        Scan all open positions for stop-loss violations.
        Returns list of tickers that have exceeded MAX_LOSS_PER_POSITION.
        Caller should force-close these positions immediately.
        
        Args:
            risk_manager: GlobalRiskManager instance to check limits
            
        Returns:
            List of ticker symbols that need force-close
        """
        stop_loss_triggered = []
        for ticker, pos in self._positions.items():
            if pos.side == "FLAT":
                continue
                
            unrealized = pos.unrealized_pnl()
            realized = pos.realized_pnl
            
            # Check if this position exceeds stop-loss
            allowed, reason = risk_manager.check_position_loss(
                ticker=ticker,
                current_unrealized_pnl=unrealized,
                current_realized_pnl=realized
            )
            
            if not allowed:
                stop_loss_triggered.append(ticker)
                logger.critical(
                    f"[POS] STOP-LOSS: {ticker} triggered — "
                    f"realized=${realized:.2f} unrealized=${unrealized:.2f} total=${realized + unrealized:.2f}"
                )
        
        return stop_loss_triggered