Exclude cancelled and reset polls from final results

Chrome acceptance in meetings 12, 14, and 15 showed cancelled/reset polls reappearing after case completion as public/protocol voting results: 0–0 chairman-decided ties or “enstemmig vedtatt.” Meeting 15’s public summary said 7 votings while nine result cards rendered because one cancelled point poll and one reset proposal poll leaked into history. This is a regression beyond completed task tsk_vc6hk3hrdc, which addressed ongoing rendering/blocking. Derive historical/public/protocol result sets from final canonical execution lifecycle, exclude cancelled and superseded generations, and keep summary counts consistent with rendered cards. Cover cancel→restart→cancel and end→reset→unanimous replacement flows.