batch-r2-upload-retry.md

area	webapp
type	fix

Fix transient R2/object store upload failures during batchTrigger() item streaming.

• Added p-retry (3 attempts, 500ms–2s exponential backoff) around uploadPacketToObjectStore in BatchPayloadProcessor.process() so transient network errors self-heal server-side rather than aborting the entire batch stream.
• Removed x-should-retry: false from the 500 response on the batch items route so the SDK's existing 5xx retry path can recover if server-side retries are exhausted. Item deduplication by index makes full-stream retries safe.