v1.1.0 — NVIDIA CUDA / RTX 5060 cross-hardware replication

Cross-hardware replication (contributor: Akshay Upadhyay / @akshbhu).

• Added NVIDIA CUDA backend (Transformers + bitsandbytes) via --backend hf|mlx|auto (additive; MLX path unchanged).
• New measured data on RTX 5060 + a controlled single-family scale experiment.
• Finding: factuality null and 'memorization driven by model scale, not precision' REPRODUCE on a second hardware family.
• Same measurement harness as v1.0.0 (comparable). Co-authors: Purnima Pathak, Akshay Upadhyay.

See CHANGELOG.md. DOI (concept): 10.6084/m9.figshare.33858859