Say the node tools are there, every minute (hq to-be 45 Phase 1, S11)

A machine whose node-engine is heard and whose runtime is gone is a
machine nobody can ask anything, and nothing said so. The runtime now
says on mesh.control.<node>.tools-alive, every minute, that it is there,
with its interval and build; the controller raises tools-silent after
three missed. Core NATS, like the host's heartbeat: a lost one is the
next one. A heartbeat the bus refuses is logged when that starts and
when it stops.

node-tools/cmd/node-tools/main.go

@@ -21,6 +21,7 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/novox/mesh-tools/node-tools/internal/alive"
 	"github.com/novox/mesh-tools/node-tools/internal/bus"
 	"github.com/novox/mesh-tools/node-tools/internal/console"
 	"github.com/novox/mesh-tools/node-tools/internal/runtime"
@@ -54,6 +55,12 @@ func main() {
 	if err != nil {
 		log.Fatalf("node-tools: %v", err)
 	}
+	// And says it is there (novox/hq to-be 45 S11): the machine's runtime, on its machine's name. A
+	// runtime on another credential — a module's own, in a test — is not the machine's.
+	stopSaying := func() {}
+	if cred.Module == runtimeModule && cred.Node != "" {
+		stopSaying = alive.Keep(conn, cred.Node, alive.Every, log.Printf)
+	}
 
 	listen := os.Getenv("MESH_CONSOLE_LISTEN")
 	if listen == "" && cred.Module == runtimeModule {
@@ -76,6 +83,7 @@ func main() {
 	signals := make(chan os.Signal, 1)
 	signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
 	<-signals
+	stopSaying()
 	stop()
 	if up != nil {
 		_ = up.Close()