Spec of a classifier model that failed to build, once seen before.
A bad spec or missing credential never fixes itself, so retrying it forever
would deny most batches without ever asking the user (approving a fallback
resets consecutive_unavailable, so a counter alone oscillates
deny/deny/ask). Latching the spec routes every later batch straight to human
approval instead. Construction is still retried each batch, so fixing the
setting — or pointing /auto model at a different spec — clears the latch
on the next successful review without a restart.
