Make the VNC server single-use and recognise crash-leftover desktop processes by their recorded command

client/vnc/server/service_agent.go

@@ -16,17 +16,6 @@ type sessionAgent interface {
 	Release()
 }
 
-// resetServiceAgent reopens the latch stopServiceAgent closed, so a restarted
-// server can build a manager again. Without it every accept loop of the new
-// lifecycle keeps getting a nil agent and service mode stays dead for the rest
-// of the process. Owned by Start, mirroring the other stop-time latches it
-// clears.
-func (s *Server) resetServiceAgent() {
-	s.serviceAgentMu.Lock()
-	defer s.serviceAgentMu.Unlock()
-	s.serviceAgentStopped = false
-}
-
 // stopServiceAgent tears down the shared manager, if one was ever built, and
 // latches the server so a still-draining accept loop cannot build another.
 // Owned by Stop rather than by an accept loop: the loops share the manager, so