Function deliver_announcement 

pub async fn deliver_announcement(
    config: &Config,
    channel: &str,
    target: &str,
    thread_id: Option<String>,
    output: &str,
) -> Result<()>

Deliver a cron job announcement to a configured channel. Scans for credential leaks before delivery.

thread_id is forwarded to channels whose outbound thread_id is distinct from the recipient (notably the webhook channel, which serialises both into the JSON callback). For channels that do not honour thread_ts it is a harmless no-op.