Report cli errors on run

This is mostly helpful when debugging or writing programs, not during usage, but
I shouldn't be suppressing errors anyway.

My first version of this patch used `Biz.Log` instead of `panic`. Unfortunately
this exposed a bug in bild: Control/Concurrent/Go.hs (and others) failed to
build because it imported `Biz.Cli` which imported `Biz.Log`, and bild couldn't
find `Biz/Log.hs`. So apparently my function `detectHaskellImports` doesn't
detect all Haskell imports, somewhere along the lines I cut the graph short
instead of recursing. I guess that will be a project for another day.

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