When metadata.json in the cache directory was written for a different,
non-zero user ID than the client's, Library.open deletes it and mldata/
and loads an empty store, so the first refresh enumerates from 0 and none
of the other account's collections, files, keys or ML results are served.
Only reachable with --cache-dir or an explicit cacheDirectory.
Model: opus-5-5
sneak