The board says what is waiting too, or it disagrees with the command

Adding "not running what the mesh would send it" to `status` and not to the
board would have left two answers to one question with a person in front of
each — which is the single thing this page's design forbids, introduced by the
change that was supposed to make the question answerable.

The published JSON carries it as well, so the page, the command and anything
built against either say the same thing from the same read. Additive, because
that shape is hard to change once anything is built against it.

Never told stays separate from out of date on the page as it is everywhere
else: same remedy, and nobody has ever asked that machine to be anything.

cmd/mesh-control/board.go

@@ -94,7 +94,8 @@ func board() http.Handler {
 			http.Error(w, err.Error(), http.StatusServiceUnavailable)
 			return
 		}
-		body, err := statusAsJSON(asked.wrong, asked.nodes, asked.quiet, asked.behind, asked.sources)
+		body, err := statusAsJSON(asked.wrong, asked.nodes, asked.quiet, asked.behind, asked.sources,
+			asked.waiting)
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
@@ -127,9 +128,17 @@ type view struct {
 	Broken      []brokenMachine
 	Quiet       []quietMachine
 	Behind      []staleModule
+	Waiting     []waitingMachine
 	At          string
 }
 
+type waitingMachine struct {
+	Node string
+	// Never told is not out of date: nobody has ever asked this machine to be anything. Same
+	// remedy, different situation, and the page says which.
+	Never bool
+}
+
 type brokenMachine struct {
 	Node string
 	// Outcome is refused or failed, and stays distinct all the way to the page. **Refused means
@@ -173,6 +182,9 @@ func viewOf(asked answers) view {
 	for _, n := range asked.quiet {
 		out.Quiet = append(out.Quiet, quietMachine{Node: n.Name, Heard: heardFrom(n)})
 	}
+	for _, m := range asked.waiting {
+		out.Waiting = append(out.Waiting, waitingMachine{Node: m.Node, Never: m.Never})
+	}
 	for module, on := range asked.behind {
 		from := asked.sources[module]
 		out.Behind = append(out.Behind, staleModule{
@@ -242,6 +254,19 @@ new, switched off, or unreachable.</p>
   {{end}}
 </ul>
 {{else}}<p class="quiet">No. Every module is what its source last had.</p>{{end}}
+
+{{if .Waiting}}
+<ul>
+  {{range .Waiting}}
+  <li><strong>{{.Node}}</strong>
+    {{if .Never}}<span class="quiet">has never been sent anything</span>
+    {{else}}<span class="quiet">is not running what the mesh would send it</span>{{end}}
+  </li>
+  {{end}}
+</ul>
+<p class="quiet">Never told is not out of date: nobody has asked that machine to be anything yet.
+Both are sent by <code>push --behind</code>.</p>
+{{else}}<p class="quiet">Every machine is running what the mesh would send it.</p>{{end}}
 {{end}}
 
 <footer>Read at {{.At}}. This page holds nothing and changes nothing.</footer>