A mesh seat's holder answers for the machine it runs on (hq ADR 0197)

The controller announces the mesh-controller seat without a machine — the seat is the mesh's — and
the console then reported it as not answering on the machine it is assigned to. An announcement that
names no machine now answers for wherever its module is assigned.

node-tools/internal/console/address_test.go

@@ -91,11 +91,12 @@ func TestTheMeshsToolsAreFoundByAddress(t *testing.T) {
 	serve("modules", func() any {
 		return out(fmt.Sprintf(`[{"module":"alpha","on":["desk"],"tools":true},{"module":"beta","on":["desk"],"tools":true},`+
 			`{"module":"gamma","on":%s,"tools":true},{"module":"delta","on":["desk"],"tools":false},`+
-			`{"module":"epsilon","on":["bench"],"tools":true}]`, gammaOn.Load().(string)))
+			`{"module":"epsilon","on":["bench"],"tools":true},{"module":"mesh-controller","on":["bench"],"tools":true}]`, gammaOn.Load().(string)))
 	})
 	stopAnn, err := announce.Serve(controller, announce.Service{Name: "mesh-controller", ID: "bench"}, func() []announce.Endpoint {
 		return []announce.Endpoint{{Kind: announce.KindSeat, Module: "mesh-controller", Seat: "mesh-controller", Scope: "mesh",
-			Tool: "nodes", Node: "bench", Description: "Every machine the mesh knows.", Schema: json.RawMessage(`{}`),
+			// As the live controller announces: a mesh seat's holder names no machine.
+			Tool: "nodes", Node: "", Description: "Every machine the mesh knows.", Schema: json.RawMessage(`{}`),
 			Subject: "mesh.seat.mesh-controller.tool.nodes"}}
 	})
 	if err != nil {
@@ -136,6 +137,9 @@ func TestTheMeshsToolsAreFoundByAddress(t *testing.T) {
 	}
 	// Silence is named only where tools should have answered: epsilon declares tools on bench and
 	// nothing there announced it; delta declares none and is never a name.
+	if strings.Contains(overview, "mesh-controller on bench") {
+		t.Errorf("a mesh seat's holder that announced no machine is called silent on its machine:\n%s", overview)
+	}
 	if !strings.Contains(overview, "epsilon on bench") || strings.Contains(overview, "delta") {
 		t.Errorf("not answering: %s", overview)
 	}