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>

docs/master-plan/04-sushiswap-integration.md

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+# SushiSwap Integration Plan
+
+## Overview
+
+This document outlines the implementation plan for SushiSwap exchange support in the MEV bot. SushiSwap is largely compatible with Uniswap V2 but has its own contracts and features.
+
+## Contract Addresses
+
+### Ethereum Mainnet
+- Router: `0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F`
+- Factory: `0xC0AEe478e3658e2610c5F7A4A2E1777cE9e4f2Ac`
+
+### Other Networks
+- Polygon: Router `0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506`
+- Arbitrum: Router `0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506`
+- Avalanche: Router `0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506`
+
+## Core Functions
+
+### Swap Functions
+- `swapExactTokensForTokens`
+- `swapTokensForExactTokens`
+- `swapExactETHForTokens`
+- `swapTokensForExactETH`
+- `getAmountsOut`
+- `getAmountsIn`
+
+### Liquidity Functions
+- `addLiquidity`
+- `addLiquidityETH`
+- `removeLiquidity`
+- `removeLiquidityETH`
+
+### Sushi-specific Features
+- Onsen (yield farming) integration
+- Kashi (lending) integration
+- SushiBar (staking) integration
+- MasterChef (liquidity mining) integration
+- BentoBox (yield aggregator)
+- Kashi V3 (next-gen lending)
+
+## Implementation Steps
+
+1. Create SushiSwap struct implementing the Exchange interface
+2. Configure multiple network support
+3. Implement standard Uniswap V2 compatible functions
+4. Add Sushi-specific reward tracking
+5. Implement SushiBar staking functions
+6. Add MasterChef integration for liquidity mining
+7. Implement cross-chain liquidity tracking
+
+## Pricing Mechanisms
+
+### Standard AMM Pricing
+- Use reserves to calculate price impact
+- Apply standard constant product formula: x * y = k
+- Consider 0.3% swap fee in calculations
+
+### Special Considerations
+- Handle Sushi reward calculations
+- Consider MasterChef incentive effects on liquidity
+- Track special pools with additional rewards
+
+## Testing Plan
+
+1. Unit tests for all swap functions
+2. Cross-network functionality verification
+3. Sushi reward tracking validation
+4. Liquidity mining calculations
+5. Integration tests with mainnet fork
+6. Edge case testing (zero amounts, max amounts)
+7. Price accuracy verification
+
+## Performance Considerations
+
+- Leverage existing Uniswap V2 knowledge for faster implementation
+- Optimize for multi-chain deployment
+- Cache frequently accessed pool information
+- Batch operations to reduce transaction costs
+- Consider SushiBar staking as liquidity source
+
+## Security Considerations
+
+- Validate all input parameters
+- Implement proper slippage protection
+- Sanitize data from external contracts
+- Verify contract addresses on different chains
+- Handle chain-specific security requirements
+
+## Integration with MEV Bot
+
+- Identify SushiSwap-specific arbitrage opportunities
+- Monitor Onsen pools for profitable swaps
+- Track Sushi rewards in opportunity evaluation
+- Include MasterChef incentives in profitability calculations
+- Coordinate with other exchanges for cross-exchange arbitrage