rebrand to ScaffDiff: update headline numbers to 6-seed (0.968 ± 0.194), 69-72% vs baselines, paper title

add mixed-scaffold fine-tuned teacher (3 epochs from teacher_v2gt, 30% lidar-cropped scaffolds, x0-chamfer loss; cd² 0.727 m² paired scaffold-free)

rewrite README around RA-L scaffold-dominant + FT-win and SMC VAE+v2GT papers; deprecate old modality-agnostic / distillation framing

fix results: correct student CD, add modality agnosticism finding

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initial commit