Consider:

  (fhpd) load /bin/ls
  (fhpd) start
  process [0.0] 1234 started, executable /bin/ls

then

  $ kill -9 1234

the response should be:

  (fhpd) Process [0.0] terminated
  (fhpd) focus
  [0.0] /bin/ls

i.e., when a process is terminated it automatically switches back to the
underlying executable; this is best implemented by the process groups having a
stack or something behind them, when the process disappears it pops that leaving
the executable underneath it

this would also simplify the current "kill" code which tries to synchronously
re-load the executable (instead the stacked executable from before the run would
be restored).