Round standings still show a DQ'd heat's metric/best-lap (ranking-vs-standings asymmetry)

[ryan-johnson2]

From the 2026-07-03 release review (confirmed, minor). #331 excludes DQ'd placements from ranking, but RoundStanding rows still surface the DQ'd heat's metric/best lap. Align: a DQ'd placement contributes no metric to the standings row either.

[ryan-johnson2]

Fixed in #346: disqualified placements contribute no metric, laps, or best lap to round standings rows (round_best_laps + the standings aggregate); clean heats still count, class standings inherit via the shared fold. Tests: dq_heat_contributes_no_metric_or_best_lap_to_the_standings_row, dq_in_one_heat_keeps_the_pilots_clean_heats_in_the_standings.