dojo: add tags to identify errors
dojo: add tags to identify errors

Particularly useful in cases where there is no trace, for example if you
simply execute `!!` or `_!! 5`.

urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit