Tell a refusal as one and an unanswered call as not known; ask a plan that fails again within the hour (issues 1316, 1314, review round 1)

cmd/mesh-controller/asker_wire.go

@@ -135,6 +135,12 @@ func (b busAsked) All(ctx context.Context) ([]asked, error) {
 	return out, nil
 }
 
+// verbRefused is a verb's own refusal of an act: the seat answered, and said no. Any other error of callAction (a bus
+// that did not answer, a grant that is refused) is not one: the verb may have run.
+type verbRefused struct{ verb, words string }
+
+func (e verbRefused) Error() string { return e.verb + " refused: " + e.words }
+
 // callAction performs an action's verb as the controller, through the grant that names it.
 func callAction(conn *nats.Conn) func(ctx context.Context, a conditions.Action, args map[string]string) error {
 	return func(ctx context.Context, a conditions.Action, args map[string]string) error {
@@ -168,7 +174,7 @@ func callAction(conn *nats.Conn) func(ctx context.Context, a conditions.Action,
 			return err
 		}
 		if answer.Error != "" {
-			return fmt.Errorf("%s refused: %s", a.Verb, answer.Error)
+			return verbRefused{verb: a.Verb, words: answer.Error}
 		}
 		return nil
 	}