Returns the latest analysis of whether the artists carried by this playlist show the playlist in Spotify's Discovered On section. The endpoint is cache-first: persisted snapshots up to 30 days old are returned without rerunning the analysis, while older snapshots are refreshed automatically. A fresh Spotify analysis also runs when no snapshot exists, or when update=true is supplied and the latest snapshot is at least 24 hours old. If update=true is supplied within 24 hours of the latest analysis, that cached snapshot is returned with a root-level details explanation. Fresh analyses inspect the playlist, up to 750 unique primary artists, each artist's Spotify monthly-listener and top-city data, and each artist's top 50 Discovered On playlists, so they are slower and more expensive than cached reads.