Quoted arguments don't work

This doesn't work:

rrun dev cog predict -i input="hello world"

I am experimenting with bash arrays to make this work but got it is messy.

Start by reproducing the quoted-argument example with the rrun command and inspect the shell argument-handling entry point, particularly the bash-array approach mentioned in the issue. Done means `rrun dev cog predict -i input="hello world"` preserves the intended argument and reaches the remote command as one value.

Written by the indexing model from the issue text.