Function check_any_pending 

pub async fn check_any_pending(
    pool: &Pool,
    target_hierarchy: &str,
) -> Result<bool, Error>

EXISTS-check: are any queue rows in scope for target_hierarchy?

Used by agents spawn’s end-of-pass restart logic to decide whether to fire another pass. The two-rule predicate matches read_pending_and_upgrade_tag’s SELECT exactly — direct hierarchy hit OR BOUND-tag hit.

No upgrade side effect. Tag-group upgrade now happens exclusively inside read_pending_and_upgrade_tag, fired by the conduit on every read-message-queue request. By the time the spawn pass ends, the conduit has already promoted every sibling tag in the group via its own reads, so this pure EXISTS check suffices for the restart decision.