Sort the Safety Net Before Refactoring

Sort each refactoring situation into the most useful first safety-net check. Unit test Characterization test Integration or contract test End-to-end smoke Extract a pure tax calculation from a long function Remove duplicate money rounding after adding a failing example Refactor a legacy parser where nobody knows every edge case Move a renewal notice formatter with production examples but no spec Swap payment SDK behind a gateway interface Inject a storage adapter that must still write to the real bucket in staging Strangle the checkout route for a small customer segment Move password reset to a new service behind routing config

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