Adapted from Soul's S-6 probe. Two puts go out on one session through a
relay that drops the first reliable datagram. The transport resends it and
delivers both in order; Odin accepts both, so both are on disk and the file
matches the working set. The probe's other finding, that the transport
acknowledges the second before the first is resent, is the transport's
defect (tracked by Self) and is not pinned here.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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