Open augment.didi.sh to reach-edu — a second tenant instance, and Stephenie Tesoro as the first client user

The deployed stack already reads the shared SurrealDB Cloud — everything reach-edu's canonical layer holds is one auth gate away. This plan opens that gate the safe way: a per-client instance (the house pattern), not a relaxed org check that would drop reach.edu users into humain-vc's workspace.