Email becomes a DeliveryChannel driven by rules, and the Team pipeline stops being
its own thing. `teamNotify.forumPost` now emits an event; a rule decides who is
mailed, through which template, and how often at most. One walk goes forum write
-> events.emit -> rule -> outbox -> worker -> email channel -> template -> SMTP.
Seven decisions settled by the org lead before any code:
- email only moves; the push tickle and the Discord bridge stay direct calls
- the EVENT carries its access-checked audience, and `members` resolves to it
- the four Team rules are seeded DISABLED, with an admin banner and a note
- team_notification_prefs stays, read by the engine as a scoped preference
- the payload wins and a structural projection fills the gaps
- the digest keeps computing at send time; only its state generalizes
- an unsubscribe token turns off the channel it names, and nothing else
Three defects found while building it:
- `email.button` never absolutized its href, while image and itemList both
did. Every rule-driven CTA would have been a dead relative link, because a
trigger's url variables are validated site-relative by construction.
- Phase 4a enqueued digest-mode recipients for a drain that Phase 6 decided
not to build. An outbox row snapshots the payload and so has none of the
three properties the digest design exists for, including the security one.
- the digest's send-log row carried no address_hash while the instant row
beside it did, which would have made half the mail uncorrelatable in Phase 9.
Also: engagement_digest_state + a replay-safe backfill, engagement_outbox.scope_key,
a v2 unsubscribe token that still verifies v1 forever, and the canonical
/public/engagement/unsubscribe pair with the old /public/teams path kept
permanently — mail is not editable once sent.
Verified with 1464 server tests, 324 client tests, and a live rig (MariaDB +
Mailpit + a real Team) covering the instant mail, the digest, the generic
template, a pre-migration unsubscribe link and the backfill's replay-safety.
Docs: RunicGateway/docs#TBD
Co-Authored-By: Claude <noreply@anthropic.com>
