testing

Test design for behavior, public seams, regression coverage, integration tests, and test-first development. Use when writing or materially revising tests, reviewing test design, choosing test seams, or when tests are a substantive part of a bug fix or feature. Do not activate merely to run an existing test command or for routine verification. Apply the TDD loop only when the user explicitly requests TDD, test-first work, or red-green-refactor.