Update Docs

For simple changes (1-2 files), it writes the docs itself. For bigger refactors or API changes, it spins up parallel agents to analyze impact, draft updates across READMEs, JSDoc, and API docs, then review for quality. The smart bit is it actually checks git status to see what changed and only documents user-facing impact, not internal refactoring. It's opinionated about avoiding documentation bloat, which is refreshing. Best for projects where you want living docs that stay in sync with code without the manual grind of updating five different markdown files after every feature.