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tiennm99
bd816156eb
core's Download returns without waiting on its worker group when the iterator reports an error, so surfacing one through Iter.Err left workers sending into a channel the caller had already closed. The iterator now always reports a nil error and stashes the real one, read after Download returns. The circuit breaker cancelled only the upload context, which left downloads running full speed against a remote refusing them: every file stayed in staging and every reservation came back, so a broken remote filled local disk faster than a working one. It now stops the download iterator instead. A failed move leaves the local copy in place, so the byte reservation cannot be handed back until the file is removed. A confirmed-short object is deleted rather than left under a name verification would count as archived forever. Also: release the reservation when opening the staging file fails, report results even when an upload errored, bound the recorded errors, and drop the reporter's lock before writing so terminal latency cannot throttle downloads.