refactoring-cataloglisted

# Refactoring Catalog A skill that improves structure through **smell → prescription → small steps** by applying Martin Fowler's *Refactoring* (2nd ed.) catalog + a code-smell taxonomy + Clean Code heuristics. For grounding facts see this skill's `reference/kb/` (smell taxonomy, function/class refactorings, conditionals/polymorphism, encapsulation moves, etc.); for higher-level principles see `reference/principles.md`. The index is `reference/kb/INDEX.md` (if you can't find the path, Glob for `principles.md`/`INDEX.md` from the bundle root). ## Application order (proceed exactly like this) 1. **Confirm the safety net** — grep for the target's regression tests. If absent, **write a characterization test first** (without one, cap a large change at MEDIUM). 2. **Smell scan** — identify smells with the review hooks in `reference/kb/code-smells.md` and route through `reference/kb/INDEX.md`. 3. **Catalog mapping** — prescribe a **named refactoring** for each smell (table below). 4. **Design small steps** — split the prescription into behavior-preserving units and compile/test after each step. 5. **Report** — Before/After + applied steps + verification commands. Prioritize by value÷risk. ## Smell → refactoring quick table | Smell | Prescription (catalog) | |---|---| | Duplicated code | Extract Function / Pull Up Method | | Long function | Extract Function, Replace Temp with Query, Decompose Conditional | | Long parameter list | Introduce Parameter Object, Preserve Whole Object