When a K8s Job is deleted externally (kubectl delete job or TTL before
terminal condition observed) and stdout has no result event, the adapter
now returns errorCode "k8s_job_deleted_externally" with the message
"K8s Job was deleted externally before Claude could complete" instead of
the misleading "Claude exited with code -1".
Tracks a jobDeletedExternally flag in execute() on the jobGone path and
checks it in the !parsed branch before falling through to buildPartialRunError.
Only applies when exitCode is null (pod gone alongside the job).
Adds regression test: FAR-31 scenario where job 404s mid-run with partial
stdout and missing pod produces the new error code.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
Chris Farhood
602afa9b84