Confirms unconfirmed series against CUBE storage and refires the rest, up
to retryMax rounds; series still unconfirmed afterwards are marked
errored. This closes the gap between a lost LONK confirmation (cosmetic)
and a retrieve that genuinely never delivered (real loss).
Confirms unconfirmed series against CUBE storage and refires the rest, up to
retryMaxrounds; series still unconfirmed afterwards are marked errored. This closes the gap between a lost LONK confirmation (cosmetic) and a retrieve that genuinely never delivered (real loss).