fix: Critical error fixes - division by zero and mock data removal

- Add zero price validation in trading_executor to prevent division by zero
- Remove mock prediction fallback - enforce NO SYNTHETIC DATA policy
- System now fails gracefully without predictions rather than using fake data

Fixes division by zero errors when executing trades
Enforces REAL_MARKET_DATA_POLICY.md compliance

web/clean_dashboard.py

@@ -6965,7 +6965,9 @@ class CleanTradingDashboard:
             logger.info("Enhanced training system initialized for model predictions")
             
         except ImportError:
-            logger.warning("Enhanced training system not available - using mock predictions")
+            # CRITICAL: NO MOCK/SYNTHETIC DATA - System runs without predictions if not available
+            logger.error("CRITICAL: Enhanced training system not available - predictions disabled. NEVER use mock data.")
+            logger.error("See: reports/REAL_MARKET_DATA_POLICY.md")
             self.training_system = None
         except Exception as e:
             logger.error(f"Error initializing enhanced training system: {e}")