A file whose copy in an album in scope does not decrypt is now backed up
from a copy that decrypted in any album, not only one in scope; with no
such copy it is still recorded as failed. The README now says the exit
code stays at 1 until the server sends a copy that decrypts or deletes it,
and that only a run without --json prints the FAILED album line.
StoredMetadata.undecryptable is required, like the other fields.
Model: opus-5-5