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>

examples/marketmanager/main.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+
 	"github.com/fraktal/mev-beta/pkg/marketmanager"
 )
 
@@ -104,7 +105,7 @@ func main() {
 	for i, opportunity := range opportunities {
 		fmt.Printf("\nOpportunity %d:\n", i+1)
 		fmt.Printf("  Path: %s -> %s\n", opportunity.Path[0], opportunity.Path[1])
-		fmt.Printf("  Input Amount: %s wei\n", opportunity.InputAmount.String())
+		fmt.Printf("  Input Amount: %s wei\n", opportunity.AmountIn.String())
 		fmt.Printf("  Profit: %s wei\n", opportunity.Profit.String())
 		fmt.Printf("  Gas Estimate: %s wei\n", opportunity.GasEstimate.String())
 		fmt.Printf("  ROI: %.2f%%\n", opportunity.ROI)