get article job

Status of a start_insight_article job: status (running | done | failed), current stage, progress 0-1, and — when done — the result with the article Markdown. Long-polls: waits up to wait_seconds (max 150) for the job to finish or change stage before answering, so an agent can simply call this again after each reply instead of sleeping. Pass wait_seconds=0 for an immediate snapshot.