Hugging Face Hub adds fastai integration with push_to_hub_fastai one-line model upload

AI Impact Summary

Hugging Face now enables a dedicated fastai integration, allowing publishing a fastai Learner to the Hub via push_to_hub_fastai. This tightens the feedback loop between fastai model development and Hub versioning, model cards, and Git LFS storage, accelerating sharing and reproducibility. To adopt, teams should install huggingface_hub[fastai] and the required fastai/fastcore/toml versions, and use the repo_id format namespace/repo when pushing new models.