A seat verb whose definition says chunks, served by a bundle that answers the whole file as the member `file`, is sent by the
runner with buscalls.SeatChunks.Send and answered with the chunk count (Conn.AnswerChunked, called from serveSeats). A chunked verb
asked of one machine (`@<node>`) is received in chunks as the verb is.
Builds: design 47 G A-257, A-249, A-254, §681
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h