The seeded account is the single admin; it can create author accounts
on the new /admin/users page (username + password) and grant each one
access to specific tags. Authors sign in to a Posts-only panel where
they can write, edit, publish, and unpublish their own posts — every
post must carry at least one granted tag, tags outside the grants are
rejected server-side, and only the admin can create tags or delete
posts (or anything else: pages, comments, settings, and backups stay
admin-only). Admin-only URLs bounce authors to their post list, and
foreign post editors 404.
posts.author_id records ownership; deleting an account keeps its posts
as unowned, admin-managed rows and signs the account out everywhere.
Backups (export v3) store the owner's username per post and re-attach
ownership on import when the account still exists.
Also fixes a latent form bug: a missing newTags field (author forms
don't render it) failed zod validation with an invisible error.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
matt