This holds the numeric error code from the last remote operation performed during this specific Downloader job's overall FSM run. This is the FSM-run-level counterpart to the per-transition remote error code kept on the Downloader object, letting an admin see the error that ultimately caused this particular download workflow to fail, even after several stages had already succeeded. A nonzero value here on an otherwise mostly-complete download points to a late-stage remote failure, such as the peer fabric interconnect rejecting the final sync step.