Get Document Intelligence Job Status
Returns the current status of a job with page-level metrics.
**Job States:**
- `Accepted`: Job created, awaiting file upload
- `Pending`: File uploaded, waiting to start
- `Running`: Processing in progress
- `Completed`: All pages processed successfully
- `PartiallyCompleted`: Some pages succeeded, some failed
- `Failed`: All pages failed or job-level error
**Page Metrics:**
Response includes detailed progress: total pages, pages processed, succeeded, failed, and per-page errors.