Add JobFailure model (step, type, message, retriable, occurred_at,
retry_count) to job.py. Add PROCESSING_FAILED to JobStatus (legacy
TTS_FAILED/RENDER_FAILED preserved for back-compat).
Add missing Job fields that existed in DB but not the Pydantic model:
organization_id, brief_id, gcs_prefix, initial_linguist_id,
initial_reviewer_id, failure, retry_count.
Add JOB_TASK_FAILED, JOB_RETRY, JOB_BULK_RETRY to AuditAction enum.
Add migration 2026-04-29-000000: processing_failed in schema validator +
compound indexes (failure.step/status) and (status/org_id/created_at).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
3e3be935c6