Method threads

src/models/ace_step/planner.cpp:1726–1726

    const PlannerWeights & weights() const noexcept { return *weights_; }
    ggml_backend_t backend() const noexcept { return backend_; }
    core::BackendType backend_type() const noexcept { return backend_type_; }
    int threads() const noexcept { return threads_; }

private: