Close the last M5 gap: a [group] may now declare an email trigger
template, materialized into a per-descendant-app row like cron/queue.
Uses the shared-group-secret model: the template resolves its
inbound_secret_ref against the GROUP's own secret store once at apply and
seals it (resolve_and_seal + insert_email_trigger_tx generalized to a
SecretOwner / ScriptOwner). Email secrets are v0/no-AAD, so the sealed
blob is portable across rows — materialize copies the bytes verbatim into
each descendant (no master key, no reseal, no new schema column, no
threading into the CRUD hooks). Each copy has its own trigger_id / inbound
webhook URL.
- apply_service/manifest: drop the two group-email rejections; a group
email template with an unset group secret still fails apply hard.
- materialize: add "email" to MATERIALIZED_KINDS + a byte-copy detail arm.
- trigger_repo: email_inbound_target gains AND t.app_id IS NOT NULL so a
group TEMPLATE row is never directly invocable via its own webhook URL
(mirrors the cron/queue app_id guards).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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