fix: apply restrictions to pending_query in _populate_distributed

Fixes #1413 — populate() with reserve_jobs=True was ignoring
restrictions passed by the caller. _populate_distributed() refreshed
the job queue with the correct restrictions but then fetched all
pending keys without filtering them. The fix intersects the pending
query with _jobs_to_do(restrictions), matching the behaviour of
_populate_direct().

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: dimitri-yatsenko

src/datajoint/autopopulate.py

@@ -493,6 +493,8 @@ def handler(signum, frame):
 
             # Fetch pending jobs ordered by priority (use CURRENT_TIMESTAMP(3) for datetime(3) precision)
             pending_query = self.jobs.pending & "scheduled_time <= CURRENT_TIMESTAMP(3)"
+            if restrictions:
+                pending_query = pending_query & self._jobs_to_do(restrictions)
             if priority is not None:
                 pending_query = pending_query & f"priority <= {priority}"