Use this skill when the user wants an implementation plan, file-by-file build plan, code skeleton, or coding conventions for a feature whose design is already done. Triggers include "implementation plan", "build plan", "file plan", "scaffold", "skeleton", "code structure", "how should I implement", "coding conventions", "PR plan", "split into PRs", "review checklist", "developer brief", or stage-3 SDLC work. This skill produces the brief a developer hands to Cursor / Copilot / Claude Code, NOT the actual code commits. Do NOT use for design (use sdlc-design) or for writing tests (use sdlc-testing).
