C1c-4: the tool runner sends a bundle's chunked seat answer in chunks, and a node's chunked verb is asked of the node

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

node-tools/internal/runtime/gate.go

@@ -94,8 +94,9 @@ func (c *consumers) chunked(key string) bool {
 	if c.definitions == nil || !strings.HasPrefix(key, "seat:") {
 		return false
 	}
-	seat, verb, ok := strings.Cut(strings.TrimPrefix(key, "seat:"), ".")
-	if !ok || strings.Contains(verb, "@") {
+	name, _, _ := strings.Cut(key, "@") // a verb asked of the machine that ran the ask is chunked as the verb is (A-254)
+	seat, verb, ok := strings.Cut(strings.TrimPrefix(name, "seat:"), ".")
+	if !ok {
 		return false
 	}
 	for _, v := range c.definitions()[seat].Verbs {