- Output parity: add `File list size` to the strict --stats differential and
document the row-#3 residual with test_stats_file_count_breakdown_residual
(rsync's `Number of files`/`Number of created files` type breakdown is not
reproducible from what the sender knows: no directory accounting and no
per-entry destination-created state). The row stays a caveat.
- Add --threads variants for the --stats and --progress/-P differentials.
The `-n --delete --threads` variant is a documented xfail: the threaded
dry-run path does not consume the receiver's STATUS_STATS delete list yet.
- Replace the 0.2s sleep flake in the delete-timing proxy with a socket
barrier: the hook now fires only after the server sends a reply (proving it
processed the preceding per-directory delete plan), using --incremental +
--ignore-times to guarantee a mid-transfer handshake reply.
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