Using OpenSpecChange courseRevise a change in flight, or decide it's cleaner to start fresh.Copy MarkdownOpenUpdate or start fresh? Revising artifacts with openspec-update-change Advanced: revising mid-implementationApply a changeRun the plan: pacing, context windows, and picking up where you left off.Existing codebasesBring OpenSpec to a codebase with a lot of code and no specs: where to start, what to backfill, and how specs grow from there.