queue_full· reason_code· applies to batch_itemPer-event rejection reason in an Applet edge transaction response (rejected[].reason_code) when the receiving side's inbound processing queue is saturated (backpressure) -- the Applet for node-to-Applet pushes, the Arkret edge for Applet-to-node pushes. The push sender MAY re-deliver the rejected events later under the same idempotency identity. See zh/extensions/applet-integration.md §7.3.