update-api-artifacts

@mrgeoffrich

Scans the entire repository and updates all documentation artifacts to match the actual source code: rebuilds API-ROUTES.md from route files, audits lib/types/permissions.ts for gaps, and spot-checks AGENT.md for stale references. Use this skill when docs are known to be out of date, after a big feature push, or to do a full reconciliation from scratch. Trigger on: "update docs", "sync docs", "regenerate API routes", "update all artifacts", "docs are stale", "refresh documentation", "full doc sync", "rebuild API-ROUTES".