Send a delivery's request in one piece

A batch went out as a write for its head, then a bracket or comma and the
send for each of its sends: two writes a send. Now the head and the whole
body are built in one buffer and written once. A receiver stopped while
20,000 sends piled up drained them at 91k sends a second before and at
470k after (three rounds each, Raspberry Pi 5). Writing the head apart
from the body measured the same (468k), so the gain is the body's; one
buffer is kept as the simpler of the two, and a lone send now leaves in
one segment instead of two.

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