| # PIXLRelight Renderer ONNX INT4 | |
| Weight-only INT4 MatMulNBits export of the PIXLRelight renderer core. This is intended for ONNX Runtime Web/WebGPU experiments where MatMulNBits kernels are available. Activations remain floating point; this is not full W4A4 quantization. | |
| Inputs: `source_images` `[B,3,512,512]` and `target_intrinsics` `[B,9,512,512]`. Outputs: `rgb`, `rgb_gain`, `rgb_bias`. | |