Makes the WebLanding 'Sign up' button work (it was 404ing — the tripit-enrollment flow didn't exist). Open passwordless registration: prompt(email,name) -> user_write(INACTIVE, external, group 'TripIt External') -> email verification (activates) -> passkey -> login. The inactive-until-verified gate is the security boundary: tripit trusts X-authentik-email, so activation must require proving inbox ownership. Passwordless login already works via the built-in webauthn flow. tripit-recovery (email -> new passkey) is built but intentionally NOT wired into the global brand recovery, so admin recovery is unchanged. Schema validated with terraform validate.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
