document-driven-development

Use for repository-level documentation-first engineering when the user explicitly requests document-driven or spec-first work, a PRD or feature contract, canonical documentation ownership, docs-to-code drift repair, synchronized docs/code/tests, or requirement-to-evidence closure. Also use for consequential externally visible or persisted behavior changes that must update an existing contract. Do not use for ordinary coding with no contract impact, one-off prose or file-format editing, architecture briefs or ADRs, or comparative source research.