parameterization isn't captured by endpoints

[tonyg]

(spawn (parameterize ((id 'monitor))
         (on (retracted (bot-running $id))
             (random-sleep 5)
             (bot))))

This could close over the parameterization in the script in the on endpoint. It doesn't at present, meaning that the random-sleep and bot calls run with the parameter at its default value, not 'monitor.

Should it close over the parameterization?