messenger: the ask-events entry's grant is the config value readers, as the events template takes it (K-24; ADR 0595; issue 1966)

modules/messenger/cmd/messenger/manifest_test.go

@@ -120,7 +120,7 @@ func TestItDeclaresTheSeatsOfAnAskAndHoldsTheOperatorChannel(t *testing.T) { //
 	// The asks it says are a bus-state entry of the events template (ADR 0595), never a stream of its own (the manifest
 	// validator refuses one that keeps no history, ADR 0619): offered and closed, kept seven days, readers by the grant.
 	if len(m.Streams) != 0 || len(m.Requires) != 1 || m.Requires[0].Template != "events" || m.Requires[0].Storage != "stream" ||
-		!reflect.DeepEqual(m.Requires[0].Options["events"], []any{"offered", "closed"}) || m.Requires[0].Options["max-age-days"] != float64(7) {
+		!reflect.DeepEqual(m.Requires[0].Options["events"], []any{"offered", "closed"}) || m.Requires[0].Options["max-age-days"] != float64(7) || m.Requires[0].Options["grant"] != "readers" {
 		t.Fatalf("streams %v, requires %+v", m.Streams, m.Requires)
 	}
 	// It holds no channel's secret: only its own bus account, read by its own account alone (ADR 0259 §8).

modules/messenger/module.json

@@ -97,7 +97,7 @@
         "events": ["offered", "closed"],
         "max-age-days": 7,
         "max-mib": 64,
-        "grant": {"config": "readers", "events": "{key}"}
+        "grant": "readers"
       }
     }
   ],