postgres: announce a consumer failed for minutes, and its recovery

A provider failed every consumer for a day and said so only in its journal
(hq issue 179). The provisioner loop now emits provisioner.failing after five
minutes without a success — create, check or secret — and repeats it every
fifteen; provisioner.recovered on the next success, on withdrawal, and on the
first success after a restart, so the controller can name it in status
(hq ADR 0224).

modules/postgres/cmd/postgres-provider/main.go

@@ -40,6 +40,14 @@ func main() {
 			Receives: receives,
 			Adapter:  provisioner{pg: pg, announce: announce},
 			Log:      func(format string, args ...any) { fmt.Fprintf(os.Stderr, format+"\n", args...) },
+			// A consumer failed for minutes is said on the bus, where the controller hears it and
+			// `status` names it (novox/hq ADR 0224).
+			Announce: func(event string, body map[string]any) {
+				if err := stdio.Emit(event, body); err != nil {
+					say("emit %s failed: %v", event, err)
+				}
+			},
+			Node: os.Getenv("MESH_NODE"),
 		}
 		go h.Run(context.Background())
 	}