Function find_first_seq

server/src/server/prefix_cache.cpp:70–78

    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() &&
        !end_usr.empty() && !start_ast.empty() && !end_ast.empty()) {
        out.family = "laguna";
        out.sys_role_prefix = start_sys;
        out.end_msg_seqs = {end_sys, end_usr, end_ast};
        out.next_role_starts = {start_usr, start_ast, start_sys};
        return true;
    }

    return false;
}