Give the grants step's restic fixture a check beside its tool, as the module rules require (repo-check of #230)

A tool check alone is refused, so the store test's c2 never registered;
the fixtures are now parsed by a test that needs no store.

cmd/mesh-controller/grants_step_test.go

@@ -177,6 +177,22 @@ func TestTheGrantsStepKeepsOneMachinesBuilds(t *testing.T) {
 	}
 }
 
+// The store test's manifests are manifests the controller takes in: checked here, where no store is needed,
+// so a fixture the module rules refuse fails before the store test is run (repo-check of #230 at 325575b2).
+func TestTheGrantsStepFixturesAreManifests(t *testing.T) {
+	for name, m := range map[string]map[string]any{"nats": natsFixture(), "restic-c1": resticFixture(false),
+		"restic-c2": resticFixture(true), "wallpaper": wallpaperFixture()} {
+		m["module"], m["version"] = strings.SplitN(name, "-", 2)[0], "1"
+		raw, err := json.Marshal(m)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if _, err := catalogue.ParseManifest(raw); err != nil {
+			t.Errorf("%s: %v", name, err)
+		}
+	}
+}
+
 // The delivery plan says the step before the merge.
 func TestAChangePlanSaysTheGrantsStep(t *testing.T) {
 	const catalogue_ = "http://forge.internal:20000/novox/mesh-catalog.git"