The live claims (#1856). Read-only: expired claims are counted, not
pruned. In Gist mode the state is refreshed first (throttled to once per
30 s by the store; a failed fetch serves the cached copy and sets a
warnings entry) so a claim another machine pushed since this process
loaded state is visible.
Work claims (#1856, #1852): record, finish, release and list in-flight implementations and PR work.