Invitation-Gated Registration

Admin-minted invitations gate sign-up: the RegisterPage only succeeds for an invited email.

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Registration requires an admin-created invitation for the exact email
InvitationManager admin panel to create list and revoke invitations
Invitation claimed atomically (markUsedIfUnused) so one invite yields one account
Same 403 for any uninvited email so registration status never leaks
Email verification link sent on successful registration
Auto-login on success via the established session

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