Function seq_at

server/src/server/prefix_cache.cpp:61–68

        out.end_msg_seqs = {{turn_end[0]}};
        out.next_role_starts = {{turn_start[0]}};
        return true;
    }

    // Try Laguna family: XML-style markers.
    auto start_sys = tok.encode("<system>");
    auto end_sys   = tok.encode("</system>");
    auto start_usr = tok.encode("<user>");
    auto end_usr   = tok.encode("</user>");
    auto start_ast = tok.encode("<assistant>");
    auto end_ast   = tok.encode("</assistant>");
    if (!start_sys.empty() && !end_sys.empty() && !start_usr.empty() &&