Say a read-only mesh-cli call in no line of its own, and count them hourly (hq issue 762)

A page polling plans every few seconds wrote about 14,000 journal lines a day. A line is judged a
read by the generic command verb's reading forms (ADR 0266), on its every word, so plans go,
conditions silence and settings set are still said; a refused or failed read is said too.

cmd/mesh-controller/push.go

@@ -297,6 +297,8 @@ func serve(ctx context.Context) (err error) {
 		return err
 	}
 	defer stopCLI()
+	// Its read calls write no line each; how many each caller made is said once an hour (novox/hq issue 762).
+	go sayReadCalls(ctx)
 	// And says so on the bus (novox/hq ADR 0197): what it serves, as the NATS services protocol asks.
 	stopAnnouncing, err := bus.Announce(seatAnnouncement(handlers), log.New(os.Stdout, "", log.LstdFlags))
 	if err != nil {