fix: spread dict access and close_position retry logic

- Fix 'dict' has no attribute 'spread' by using .get("spread", 0)
- Add 3-retry loop to close_position() with fresh price each attempt
- Match retry pattern from send_order() for consistency

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

main_live.py

@@ -1220,7 +1220,7 @@ class TradingBot:
                     regime=regime,
                     volatility=volatility,
                     session=session_status.get("session", "unknown"),
-                    spread=self.mt5.get_symbol_info(self.config.symbol).spread if hasattr(self.mt5, 'get_symbol_info') else 0,
+                    spread=self.mt5.get_symbol_info(self.config.symbol).get("spread", 0) if hasattr(self.mt5, 'get_symbol_info') else 0,
                     atr=0,  # ATR calculated in main loop, not available here
                     smc_signal=signal.signal_type,
                     smc_confidence=signal.confidence,