TDD-first feature development — crystallise API as a demo test, drive implementation to pass it, run quality stack and progressive review loop. TRIGGER when: user asks to build new functionality, add a capability, or implement a feature in a Python project; phrases: \"add X\", \"implement Y\", \"bui
TDD-first feature development — crystallise API as a demo test, drive implementation to pass it, run quality stack and progressive review loop. TRIGGER when: user asks to build new functionality, add a capability, or implement a feature in a Python project; phrases: \"add X\", \"implement Y\", \"build Z feature\", \"create a new module for\". SKIP when: bug fixes (use `/develop:fix`); refactoring