Issue the provisioner client its own account when its module declares no broker

The catalogue's mesh-provisioner-client declares only provisioner-broker:
the client speaks on the bus as itself. module issue refused it for
lacking a broker, assign minted nothing, and push refused it for lacking
an account, so no machine could run the client (issue 917).

cmd/mesh-controller/provisioner_account_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"slices"
+	"strings"
 	"testing"
 
 	"github.com/novox/mesh-controller/internal/broker"
@@ -60,3 +61,32 @@ func TestTheProvisionerClientsAccountIsIssuedForItsServiceAndNeverInvented(t *te
 		t.Fatal("a module with nowhere to read the client's account is read as running it")
 	}
 }
+
+// A module that runs the client and declares no broker of its own, as the catalogue's mesh-provisioner-client does,
+// may be issued: the client's account alone (issue 917). Before, `module issue` refused it for having no broker,
+// while a push refused it for having no account, so no machine could run the client.
+func TestAClientWithoutABrokerOfItsOwnMayBeIssued(t *testing.T) {
+	if err := mayIssue(aClientModule()); err != nil {
+		t.Fatalf("the client alone is refused an account: %v", err)
+	}
+	neither := aBot("bot", false)
+	if err := mayIssue(neither); err == nil {
+		t.Fatal("a module with nowhere to read any account may be issued one")
+	}
+}
+
+// Assigning the client tries to issue the client's account, as assigning any module issues its broker (issue 917):
+// without a bus to issue on, the line says so and names the verb, never nothing.
+func TestAssigningTheClientIssuesItsAccount(t *testing.T) {
+	open := aMesh(t)
+	ctx := t.Context()
+	client := aClientModule()
+	register(t, open, client)
+	out, err := assign(ctx, open, "laptop", client.Module)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(out, "bus credential") {
+		t.Fatalf("assigning the client said nothing of its account:\n%s", out)
+	}
+}