pub fn walkthrough_viewed_files(
guide: &StandardWalkthroughGuide,
viewed: &ViewedState,
) -> Vec<String>Expand description
The root-relative files (in direction.order) the local ledger marked viewed
against the guide’s current hash. Exposed so the markdown surface can collapse
the same viewed files into Cleared that the human surface does, keeping the two
formats consistent on the same on-disk --mark-viewed state.