Method add_command

src/command/command.cpp:568–576

            id == option::OPT_working_directory || id == option::OPT_working_directory_EQ;
        for(auto& value: local.values) {
            value = anchored(id, value, working ? directory : anchor, strings).data();
        }

        args.push_back(std::move(local));
    }

    if(!slot_placed) {
        place_slot();
    }

    /// Build the pointer-stable Arg view over the staging storage; the
    /// values arrays are deep-persisted only if the config wins insertion.