Method shutdown

capstone/sensor_pipeline.hpp:64–71

    }

    void shutdown() {
        {
            std::lock_guard<std::mutex> lock(mux_);
            active_ = false;
        }
        cv_data_.notify_all();
        cv_space_.notify_all();
    }

    [[nodiscard]] std::size_t size() const {
        std::lock_guard<std::mutex> lock(mux_);