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/5_development/OVERVIEW.md

@@ -55,6 +55,7 @@ The MEV Bot project follows established best practices for Go development:
 - **GolangCI-Lint** - Code linting
 - **GoSec** - Security scanning
 - **Go Test** - Testing framework
-- **GitHub Actions** - CI/CD pipeline
+- **Drone CI** - Primary automation pipeline
+- **Harness** - Staging/production promotion orchestrator
 
-For detailed information about development practices and procedures, see the individual documentation files.
+For detailed information about development practices and procedures, see the individual documentation files.