Outcome of the Welcome fanout performed after a confirmed group-evolution
publication. Unlike AncillaryEffectOutcome, a Welcome fanout
reports one outcome per invitee (via WelcomeDeliveryOutcome) so a
failed invitee is independently retryable (FOUND-04, D-06) — persistence
stays a single AncillaryEffectOutcome because persistence is one
write, not per-recipient.
Outcome of the Welcome fanout performed after a confirmed group-evolution publication. Unlike AncillaryEffectOutcome, a Welcome fanout reports one outcome per invitee (via WelcomeDeliveryOutcome) so a failed invitee is independently retryable (FOUND-04, D-06) —
persistencestays a single AncillaryEffectOutcome because persistence is one write, not per-recipient.