--node-module arg not available

in the olden days of .run, it was possible to do this:

`dotrun --node-module $(pwd)/../vanilla-framework`
Being abl to run a site like ubuntu.com on a local version of vanilla was very useful, efor example to see how a change in the framework would affect things downstream.

That doesn't seem to work with `dotrun`. Can this be reintroduced please?

Start by tracing dotrun's CLI argument handling and looking for the older .run implementation of --node-module. Check how local Node module paths are passed to the site, then verify that a downstream site can run with a local vanilla-framework checkout as requested.

Written by the indexing model from the issue text.