refactor

Use this template to refactor legacy code toward a stated goal, with safety.

INPUTS

• Code - the code to refactor
• Refactor goal - e.g., improve readability, adopt a pattern, reduce coupling
• (optional) Constraints

INSTRUCTIONS

1. Restate the refactor goal and constraints. Preserve behavior.
2. Propose a target design (patterns, boundaries, contracts).
3. Provide a refactored version or representative slices.
4. Explain rationale trade-offs (perf, readability, testability).
5. Add safety checks: tests, metrics, and rollout steps.
6. Show an incremental plan of small commits.
7. Keep lines ≤80 chars.

OUTPUT FORMAT