fix(cli): say the token is missing when join gets only an address

Three attempts at `collie join <address>` with no token got only the
bare usage line. Now a lead address with no token also explains that
the token is a required second argument, shows the exact `join ...  -`
command with the address the operator typed, and points at
`collie pack invite` to mint one.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>