feat: qualify complete K1 replay on worker

tests/test_lidar_local_surface.py

@@ -360,6 +360,8 @@ def test_k1_local_surface_shadow_matches_replay_and_stays_non_authoritative(
         assert snapshot["queue"]["published"] == len(published)
         assert snapshot["queue"]["consumed"] == len(published)
         assert snapshot["queue"]["dropped_overflow"] == 0
+        assert snapshot["delivery"]["source_span_seconds"] > 0
+        assert snapshot["delivery"]["effective_fps"] > 0
         assert snapshot["results"]["failed"] == 0
         assert snapshot["occupancy_policy"]["absence_of_points_means_free"] is False
         assert snapshot["authority"]["commands_enabled"] is False