This is an indexing problem, not a federation problem. Personally, if I want to find software, I use Google, Rubygems, or NPM. Github is a distant third option. But this project is about data interchange between forges. It doesn't solve the indexing / discoverability problem.

Having a better code search crawler that can grab data from independent git repos would be really cool. But being able to submit a PR from server 1 to server 2 is pretty unrelated to that.