Document the robotics Video Preview card

[epence12]

Documents how the Video Preview card on robotics model pages is populated. This is not covered by the current widget metadata spec, and the existing guidance points readers toward example outputs, which the card ignores.

• Add a "Video previews for robotics models" section covering the replay.mp4 lookup at the repository root on main, the "Preview not found" fallback, and the fact that widget metadata is not read.
• Note the Git LFS tracking rule and link lerobot/diffusion_pusht as a repository with the file in place.
• Flag the robotics exception in "Widget Availability and Provider Support", where models without provider support are currently pointed at example outputs.

Validation: Checked against the widget bundle served on model pages, which issues a single HEAD request for /{model_id}/resolve/main/replay.mp4 and falls back to "Preview not found" when that returns an error. widget entries using output.url, src, and both together were tested on a scratch robotics repo and none of them populated the card. A repository with replay.mp4 at the root rendered the video as described. This covers the robotics card only, not the other task widgets.

Related: huggingface/huggingface.js#722 and huggingface/lerobot#227.

Assisted by Claude Code

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Note

Low Risk
Documentation-only change with no runtime or security impact.

Overview
Adds documentation for how robotics model pages show a Video Preview card instead of the usual inference widget.

The new section explains that the UI only checks for replay.mp4 at the repo root on main (not widget metadata or example outputs), what happens when the file is missing, Git LFS tracking, and links an example repo. Widget Availability and Provider Support now points robotics authors to that section instead of only example outputs.

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