Initial release: HDRDiT v1

Single-Image SDR to HDR Reconstruction via LogC3-Encoded Diffusion Transformer LoRA.

- inference.py: Complete inference pipeline (SDR → HDR EXR)
- logc3.py: ARRI LogC3 transfer function
- README.md: Documentation with usage, technical details, training info
- model_card.md: HuggingFace model card

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>