List In Flight Import Jobs

The caller's running imports — the safety net under the SSE progress feed.

Polled on a slow cadence only while something is in flight, mirroring the enrichment equivalent, because the publish path swallows its own failures. Never selects working_set: that column is tens of KB per row and inlining it here would detoast every job on every poll.

Reclaims stranded rows first. This read is where "still working" is believed, so it is also where a run nobody is working on has to stop being believed — a lazy fallback at the consumer rather than a sweep, since the poll only runs while a client thinks something is in flight.