Logs in as the seeded "reader" user (READ_ALL only) and asserts
that all write controls are absent from every page.
Refs #48
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Block direct URL navigation to /persons/new, /documents/new,
/documents/:id/edit for users without WRITE_ALL permission.
E2E tests verify admin user retains access to all write routes.
Closes#17
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>