The roadmap being the sticky thread, right?

Correct

There’s not a live version somewhere showing what the current development focus is, is there?

I make WIP posts and sticky them whenever I work on a new release. Usually I come up with the focus while working on the release. I tend to tackling things on the roadmap in order (from top to bottom). Note that this is also in the order that I receive feature requests, ie. features at the top of the list were submitted earlier than features at the bottom.

However, I also prioritize working on things that are easier to implement. Note that by easy to implement I don't always mean "lines of code" or "effort". There could be a lot of factors such as whether i perceive the feature to be controversial, and thus it would require more thought and possibly polling the community for feedback before I can implement the feature.

I will also do themed releases sometimes. Eg. there's been releases where I focus on moderation tools and so I would look at the moderation related feature requests only.

I work on changes on a whim based on what I feel is important and what I have the resources for so it's difficult to give a general answer here (eg. if I have a busy week and can't commit much time then I might prioritize easy to implement features).

User-level vote tracking is the killer feature of Voyager IMO, and it’s the main thing keeping me from jumping to another client since afaik it’s the only one to have that feature.

This is actually already tracked by Summit, it's just not exposed yet which makes it a pretty easy feature to implement since 95% of the work is already done. I can take a look to see if I can prioritize it since it's so low effort.