Owned daemon that consumes from the mesh amqp provision (lavinmq) and
forwards to SMTP. No ports, no route. AMQP host/port/user/password
templated from the amqp grant (analog: amqp-ping); vhost/exchange/queue
are the app's own config; SMTP user+password are given own-secrets
(secret accept). See report for the EMAILDELIVERY_T vhost integration flag.
