docs: public void addState(long agreementHSId) {
          SiteState ss = m_stateBySite.get(agreementHSId);
          if (ss != null) return;
          ss = new SiteState();
          ss.hsId = agreementHSId;
          ss.newestConfirmedTxnId = m_newestConfirmedTxnId;
          m_stateBySite.put(agreementHSId, ss);
      }