mesh-cli: say an outcome not known, and hold the module to placing one file (review of hq ADR 0272)

A line whose answer did not come in time is said as possibly run, with
its call, never as nothing having run. A test holds the module to one
archive resource unpacking one compiled Go bundle into /usr/local/bin.
The README says the MESH_VERB refusal is a courtesy and the controller is
the gate. SDK pinned at the go/cli branch's newest commit until go/v0.1.9.

modules/mesh-cli/cmd/mesh-cli/main.go

@@ -69,6 +69,13 @@ func run(ctx context.Context, args []string, stdout, stderr io.Writer) int {
 	if !a.Terminal && a.Why != "" {
 		fmt.Fprintln(stderr, "mesh-cli: "+a.Why)
 	}
+	if a.Unknown != "" {
+		// Asked, and what came of it not known: never said as nothing having run.
+		fmt.Fprintln(stderr, "mesh-cli: "+a.Unknown)
+		if a.Exit == 0 {
+			return 1
+		}
+	}
 	if a.Refused != "" {
 		fmt.Fprintln(stderr, "mesh-cli: "+a.Refused)
 		if a.Exit == 0 {