Work claims (#1856, #1852): record, finish, release and list in-flight implementations and PR work.
Drop claims (#1856, #1852): the claim on url, or every claim session holds (Session End releases that session's pr claims with { session, kind: 'pr' }). Releasing an item nobody holds is not an error: released is simply empty.
url
session
pr
{ session, kind: 'pr' }
released
When neither url nor session is given.
Work claims (#1856, #1852): record, finish, release and list in-flight implementations and PR work.