fix(multicall): resolve critical multicall parsing corruption issues

- Added comprehensive bounds checking to prevent buffer overruns in multicall parsing
- Implemented graduated validation system (Strict/Moderate/Permissive) to reduce false positives
- Added LRU caching system for address validation with 10-minute TTL
- Enhanced ABI decoder with missing Universal Router and Arbitrum-specific DEX signatures
- Fixed duplicate function declarations and import conflicts across multiple files
- Added error recovery mechanisms with multiple fallback strategies
- Updated tests to handle new validation behavior for suspicious addresses
- Fixed parser test expectations for improved validation system
- Applied gofmt formatting fixes to ensure code style compliance
- Fixed mutex copying issues in monitoring package by introducing MetricsSnapshot
- Resolved critical security vulnerabilities in heuristic address extraction
- Progress: Updated TODO audit from 10% to 35% complete

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

pkg/execution/queue.go

@@ -160,7 +160,7 @@ func (eq *ExecutionQueue) AddOpportunity(opportunity *pkgtypes.ArbitrageOpportun
 		profitFloat, accuracy = profitEth.Float64()
 		// Check if the conversion was exact (accuracy == 0) or if there was a loss of precision
 		if accuracy != big.Exact {
-			eq.logger.Warn("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy)
+			eq.logger.Warn(fmt.Sprintf("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy))
 		}
 	}
 	eq.logger.Info(fmt.Sprintf("📋 Added arbitrage opportunity to queue: %.6f ETH profit, priority: %.2f",
@@ -180,7 +180,7 @@ func (eq *ExecutionQueue) calculatePriority(opp *pkgtypes.ArbitrageOpportunity)
 		profitScore, accuracy = profitEth.Float64()
 		// Check if the conversion was exact (accuracy == 0) or if there was a loss of precision
 		if accuracy != big.Exact {
-			eq.logger.Warn("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy)
+			eq.logger.Warn(fmt.Sprintf("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy))
 		}
 		profitScore *= ProfitScoreScaleFactor // Scale by factor
 	}
@@ -250,7 +250,7 @@ func (eq *ExecutionQueue) processNext() {
 			profitFloat, accuracy = profitEth.Float64()
 			// Check if the conversion was exact (accuracy == 0) or if there was a loss of precision
 			if accuracy != big.Exact {
-				eq.logger.Warn("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy)
+				eq.logger.Warn(fmt.Sprintf("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy))
 			}
 		}
 		eq.totalProfitUSD += profitFloat
@@ -289,7 +289,7 @@ func (eq *ExecutionQueue) executeOpportunity(item *ExecutionItem) bool {
 		profitFloat, accuracy = profitEth.Float64()
 		// Check if the conversion was exact (accuracy == 0) or if there was a loss of precision
 		if accuracy != big.Exact {
-			eq.logger.Warn("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy)
+			eq.logger.Warn(fmt.Sprintf("NetProfit conversion to float64 may have lost precision, accuracy: %v", accuracy))
 		}
 	}