Function require_assets

src/models/heartmula/codec.cpp:46–50

struct FlowEstimatorBuildResult {
    core::TensorValue output;
    ggml_tensor * first_stage_state = nullptr;
};

void require_assets(const HeartMuLaAssets & assets) {
    if (assets.codec_weights == nullptr) {
        throw std::runtime_error("HeartCodec requires codec weights");
    }
}