- plain --delete with no timing flag now selects delete-during (progressive
deletion, matching rsync and avoiding the full old+new tree peak)
- new long-only FastSync --delete-commit restores the old atomic behavior
(delete only after the whole transfer succeeds); timing-identical to
--delete-after, implemented via the same wire bool
- timing flags are mutually exclusive; --delete-commit conflicts with other
timings; --delete-before/--delete-during rows reworded per Phase-0 probes
- CHANGELOG migration note; tally unchanged 116/14/27
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