Poll the status of an async ingest run. ``status`` distinguishes ``abandoned`` (the content was accepted and is not known to have been stored) from ``unknown_run_id`` (no such run). Before the run ledger these were the same reply, so a caller could never learn that content was lost. Goes through the scoped facade, which refuses a run belonging to another workspace. The previous implementation constructed the transport here and read the status hash directly, so any authenticated caller could read any tenant's run.