Constant FEED_SORT_VALUES_DOC 

pub const FEED_SORT_VALUES_DOC: &str = "`date` (newest first, the default), `score` (highest net \
     score first), `active` (most recent comment activity first), `random` \
     (uniformly shuffled), `controversial` (most comments, lowest score first — \
     heated debates), `diverse` (embedding-distance-maximized spread across topics; \
     posts without an embedding yet still appear, just not diversity-optimized), and \
     `unpopular` (lowest score first, restricted to posts from the last \
     14 days — a recently-buried post gets a second look in front of fresh \
     readers, not a permanent pillory for old flops).";

The seven FeedSort values, for get_feed and the dashboard