signUpForClass enqueues class_signup_registered or class_signup_waitlisted
based on the RPC return shape; recipient is the affected member, so a
manager signing someone else up still emails the target. cancelMySignup
enqueues class_signup_promoted to whoever was bumped from the waitlist
into the session (the promoted_id returned by class_cancel_tx).
updateSession, when status flips to 'cancelled', fans out a
class_session_cancelled email to every still-active signup (one row per
member, dedupe by session + member).
No type for plain self-cancel: cancelMySignup is self-only and the rule
is "only when someone other than the affected member cancelled," so it
has no caller.
Adds renderClassEmail + classDedupeKey to notifications-logic; 9 new
render/dedupe unit tests cover each type's subject + body and the
session-cancelled per-member dedupe shape.
Suite 559, build clean.
Moheeb Zara
105b62f28a