pub async fn assert_enqueue_backpressure(store: Arc<dyn Inspect>, queue: &str)Expand description
Shared live-backend proof for bounded enqueue. It deliberately drives contention: 64 producers race for 25 slots, then the helper verifies idempotent replay, atomic batch rejection, capacity release on terminalization, lowering below current depth, and disabling the policy. Every assertion uses the public Store/Inspect ports.