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tiennm99
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Phases 4 through 6: the two legs and the command that joins them. Downloads go to <name>.part and are renamed only once complete, so a file without the suffix is always whole. That is what lets the upload leg treat "exists" as "finished" — the property run.sh could only approximate with a filename convention plus an age guard, because it could not see inside tdl. Every finished file is checked against the size Telegram reported, and that check rather than the error is the authoritative signal. core's downloader logs a failed transfer and returns nil, and its completion callback is deferred on that named return, so a failure arrives indistinguishable from a success. Trusting it would promote a truncated file and archive it as complete. The disk cap is a semaphore over bytes. A download reserves its own size before starting and releases it only after the upload confirms, so a slow remote stalls downloads by itself. Blocking the iterator is safe because the downloader calls it from its dispatch loop while workers run in a group, so a blocked iterator never stops the uploads that free the space. Gone with it: the du polling, the SIGSTOP and SIGCONT suspension, the min-age guard, the temp-file filter and the sweep-failure counter. A cap smaller than the largest file is refused up front. The semaphore could never admit it, and a run blocked on a file it can never start looks exactly like a stalled remote. Uploads re-state each object to prove its size before the local copy is gone, closing a gap where a truncated upload was only noticed by a later verify. The destination is created before the chat is read. It is also the credentials check, and doing it first means a bad destination fails in seconds rather than after a full history walk. One invocation converges: each item is checked against the index immediately before download, so there are no passes and re-running is the resume path. Options that no longer exist say what replaced them instead of failing as unknown flags. Verified end to end against the live chat and a scratch remote path: two files downloaded, uploaded, confirmed present at the right size, staging left empty.