Report each macOS app's build commit in /api/admin/status

internal/server/sse.go

@@ -55,7 +55,12 @@ func (s *Server) StreamEvents(w http.ResponseWriter, r *http.Request, params api
 	w.Header().Set("Cache-Control", "no-cache")
 	w.WriteHeader(http.StatusOK)
 
-	live := s.hub.subscribe()
+	live := s.hub.subscribe(api.ConnectedClient{
+		Login:       viewer,
+		Host:        r.Header.Get("Byre-Host"),
+		Commit:      r.Header.Get("Byre-Commit"),
+		ConnectedAt: time.Now(),
+	})
 	defer s.hub.unsubscribe(live)
 
 	for {