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/05-curve-integration.md

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+# Curve Integration Plan
+
+## Overview
+
+This document outlines the implementation plan for Curve exchange support in the MEV bot. Curve specializes in stablecoin and pegged-asset swaps with low slippage and low fees.
+
+## Contract Architecture
+
+### Core Contracts
+- Main Registry: `0x7D86446dDb609eD0F5f8684AcF3037Ffb6149cC6`
+- Factory Registry: `0xF1815bdCbcC67D79Cbb7B3C7b2E6d9992E6C1e86`
+- Router: `0x8474DdbE98F5aC77e0C38b3C97ad441436D69d2C`
+- Exchange Proxy: `0xD152CC3E6A9Ca3Cd5085767eD16a8921152B6867`
+
+### Pool Types
+- StableSwap pools (3pool, 4pool, etc.)
+- CryptoSwap pools (tricrypto, etc.)
+- MetaStable pools
+- Lending pools
+- Factory pools
+
+## Core Functions
+
+### Swap Functions
+- `exchange` (basic swap)
+- `exchange_underlying` (swap underlying assets)
+- `get_dy` (calculate output without executing)
+- `get_dx` (calculate input without executing)
+- `exchange_extra` (swap with additional features)
+
+### Pool Management
+- `add_liquidity`
+- `remove_liquidity`
+- `remove_liquidity_one_coin`
+- `calc_token_amount` (estimate LP token amount)
+- `calc_withdraw_one_coin` (estimate withdrawal amount)
+
+### Pool-Specific Functions
+- Pool-specific swap functions for different curve types
+- Virtual price calculations
+- Fee distribution functions
+- Pool parameter modifications
+
+## Implementation Steps
+
+1. Create Curve struct implementing the Exchange interface
+2. Implement adapter for different pool types
+3. Handle curve's unique pricing mechanism (constant function AMM optimized for similar assets)
+4. Implement multi-hop swaps between different pool types
+5. Add support for underlying asset swaps
+6. Implement virtual price calculations
+7. Add support for factory-deployed pools
+8. Create pool discovery and indexing functions
+
+## Pricing Mechanisms
+
+### Curve-Specific Pricing
+- Use Curve's mathematical formula for stablecoin swaps
+- Account for amplification coefficient (A)
+- Consider fee structure (dynamic based on trade size)
+- Handle different pool types with varying parameters
+- Calculate virtual price for accurate pricing
+
+### Multi-Asset Pools
+- Support for pools with 2, 3, 4+ assets
+- Handle asymmetric deposits/withdrawals
+- Calculate effective rates between different asset pairs
+
+## Testing Plan
+
+1. Unit tests for stablecoin swap functions
+2. Testing with different amplification coefficients
+3. Virtual price calculation verification
+4. Multi-asset pool testing
+5. Factory pool integration tests
+6. Edge case testing (extreme amounts, pool imbalance)
+7. Price accuracy verification across different pool types
+8. Gas optimization testing
+
+## Performance Considerations
+
+- Optimize for low slippage stablecoin swaps
+- Cache pool parameters to reduce external calls
+- Implement efficient multi-hop routing
+- Consider pool liquidity depth for trade execution
+- Batch operations where possible
+
+## Security Considerations
+
+- Validate curve pool addresses and parameters
+- Implement proper slippage protection despite low slippage
+- Handle emergency pause functions
+- Verify gauge contracts for liquidity mining
+- Sanitize data from external curve contracts
+
+## Integration with MEV Bot
+
+- Identify curve-specific arbitrage opportunities
+- Monitor stablecoin pools for profitable swaps
+- Track meta-stable pools for cross-chain opportunities
+- Include lending pools in yield farming strategies
+- Coordinate with other exchanges for maximum profit