JSON shape comes from core's ParseRestPublishBody — the mapping WorkQueueApiPublisher also uses (03 §9), so client
and server cannot drift. This wrapper only applies the extension's own MaxBatch. Envelope semantics are validated
by PublishAs, per item.
JSON shape comes from core's ParseRestPublishBody — the mapping WorkQueueApiPublisher also uses (03 §9), so client and server cannot drift. This wrapper only applies the extension's own MaxBatch. Envelope semantics are validated by PublishAs, per item.