fix: treat DSM 599 as task-not-ready in _poll_task, poll until 60s timeout
DirSize/MD5 return error 599 while the async task is still initialising on the NAS, not only after the task is gone. Remove the 5-consecutive-599 abort limit and the debug stderr logging; instead pass on 599 and keep polling until the existing 60 s timeout fires. Rename the test that checked the old limit to reflect the new timeout-based behaviour. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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