- Recursive scans emit a directory entry for every traversed directory that
produced no transferred child, so empty source dirs (and dirs emptied by
filtering) are recreated like rsync; -m prunes them, --files-from/--list-only
never emit implicit dirs.
- A directory entry now replaces a destination regular file (rsync removes the
non-directory) instead of aborting; confined to the secure parent fd.
- -R --no-implied-dirs --files-from: stop refusing a listed file whose parent
is not listed; create the implied parent with default attributes (no source
metadata is captured for it), matching rsync 3.4.1.
- Differential gate: drop min_size/empty_dirs_recursive/dirs_plain allowlist
entries (dirs_plain now hands FastSync the same trailing-slash source as
rsync); add differential test for the files-from implied parent.
- Docs: -d row -> Parity, tally 108/24/24.
No wire change (PROTOCOL_VERSION stays 2.26.0).
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