A visit to the sign-in portal with no follow-up now continues to
https://users.coulomb.social. A provided follow-up still wins. The
success screen cannot carry a custom link.
Assistant: grok
Assistant-Session: 01a0d25d-d358-7e13-b84a-d007fbb7e34f
Seed LLDAP activity-core-operators, add membership runbook and helper,
restrict Authelia access on activity/temporal.coulomb.social to that
group (member one_factor + domain deny fallback), apply live, and verify
via Authelia check-policy plus unauthenticated edge redirects.