Triggers

Trigger	When it fires
`submission.created`	A clean submission lands (post-spam-scan).
`submission.updated`	A submission's payload or tags change.
`submission.tagged`	A tag is added (manual or automated).
`submission.marked_spam`	A submission moves to spam.
`submission.starred`	A user stars a submission.
`manual`	"Run now" or API `/run`.
`schedule.cron`	Cron expression in `trigger_config.cron`.
`webhook.failed`	A webhook delivery exhausts retries.