Mount the one unauthenticated read route OUTSIDE the /api auth router.
A live token resolves via validateShare to exactly one document, rendered
inline (application/pdf) through the existing documentHtml -> renderPdf path;
unknown/expired/revoked tokens return a plain 404 "link expired or invalid"
HTML page carrying no document data. Adds a dependency-free per-IP fixed-window
rate limiter to blunt token brute-forcing. renderPdf is injected so the route
is TDD-tested without launching Chrome. Public reads write no audit; the token
is never logged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Thomas Joise