OK, I have the go-ahead for making commits to the core.rrb-vector library. Should I just clone the Github repo, make one or more commits locally on my machine, then push, as if it were my own Github repo?

I've created N patches for various repos, but never committed to one yet.

you can, just coordinate with Michał. or you can put on a branch and merge if that makes you happier.

Only things on master branch trigger retest on http://build.clojure.org I suppose?