Refactor code while preserving behavior, improving clarity, and reducing complexity.

• Covers five core refactoring patterns: Extract Method, DRY principle removal, conditional-to-polymorphism conversion, parameter object introduction, and SOLID principle application
• Includes behavior validation workflow with pre-refactoring analysis, post-refactoring testing (unit, type, lint, snapshot), and change documentation
• Provides refactoring checklist covering function length, parameter count, nesting depth, magic numbers, and self-documentation
• Enforces mandatory constraints: write tests first, change one thing at a time, preserve all functional behavior
• Supports multi-agent workflows with role-based verification across orchestration, analysis, and test execution phases