Produces a refactor plan and files it as a GitHub issue for review: interviews the user about the pain and the constraints, checks every claim against the code, weighs alternatives, pins down behaviour that must not change, and lays the work out as a sequence of small commits that each keep the build and tests passing. Use when the user says "plan this refactor", "write a refactoring RFC", "I want to restructure this module safely", "break this refactor into small steps", or "open an issue proposing a refactor".
