TripIt external users are now LOCAL TripIt accounts (ADR-0028 native passkey + Authentik OIDC), so the Authentik-side self-enrollment machinery is dead. Removes the tripit-enrollment + tripit-recovery flows and all their stages/prompts/policies/bindings, the tripit-email-stages blueprint (+yaml), and the 'TripIt External' group; reverts the admin-services-restriction fence branch that contained those users (its sole member, the leftover tripit-demo@ test account, was deleted first, so the revert affects zero live principals). Real external collaborators (type=external) are untouched. tg plan: 0 add, 1 change (the policy expression), 20 destroy (all tripit_*). Closes tripit#97; moots the B2 per-app OIDC fences.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>