memba_feed_v1 package

ListFeedJSON returns the newest live posts strictly older than cursor (cursor == 0 → from the top). Pass the last id of the previous window as the next cursor.

ReverseIterate treats BOTH bounds as inclusive (avl/v0 TraverseInRange), so "strictly older than cursor" = end bound padID(cursor-1): ids are integers, keys are fixed-width, hence key < padID(cursor) ⟺ key ≤ padID(cursor-1).