crosscutting-documentation

Writes and maintains technical documentation including API docs, README files, and Architecture Decision Records. Use when the user asks to document an API, write a README, create documentation, update docs, write an ADR, or document a design decision. Triggers on phrases like "write the README", "document this", "API documentation", "update the docs", "write an ADR", "create a changelog". Not for code comments (use code-review skill to flag missing comments).