Add converted marimo notebooks (batch 1)

[ktaletsk]

Summary

This PR adds the first batch of five polished marimo conversions:

• Log_(Almost)_Anything_with_W&B_Media
• Huggingface_wandb
• configs_in_w_b
• w_b_tables_quickstart
• Use_WandbModelCheckpoint_in_your_Keras_workflow

Across the batch, the notebooks now:

• preserve the original tutorial flow while adapting execution to marimo's reactive graph
• use one visible setup cell and one consistent W&B authentication section
• hide implementation-only authentication, status, and embed helpers while keeping teaching code visible
• gate expensive or remote-write steps behind explicit forms and run buttons
• use descriptive W&B run names and surface links to created runs
• use a single level-one title, consistent heading hierarchy, and no decorative emojis
• declare complete PEP 723 dependencies for Molab

Notebook-specific work includes:

• streaming public tutorial assets with fsspec instead of cloning the repository
• correcting media handling for MP4, audio, HTML, OBJ, and point-cloud data
• embedding the media tutorial video and adding theme-aware W&B logos
• downloading and running the Hugging Face GLUE example with explicit W&B integration, a live run URL, and GPU-aware guidance
• restoring the argparse and Public API config examples with staged interaction gates
• adding gated MNIST training, a PyTorch model preview, and W&B Tables result guidance
• preserving the Keras model summary and demonstrating WandbModelCheckpoint in a gated training workflow

This PR is intentionally stacked on wandbify_skills / #647. The automated PR comment contains direct Molab links for all five notebooks.

Validation

• uvx marimo check passes without warnings for all five notebooks
• all five notebooks were reviewed in Molab
• the media logging examples, Hugging Face training, config workflows, Tables training, and Keras training were exercised successfully
• setup-cell visibility, hidden helper cells, rendered forms, run gates, and W&B result links were checked in the live notebooks

[github-actions]

▶️ Run the marimo notebook(s) in this PR

molab launches any public marimo notebook on GitHub in a hosted environment — no local setup required.

Notebook	molab
marimo/convert/configs-in-w-b/configs_in_w_b.py
marimo/convert/huggingface-wandb/huggingface_wandb.py
marimo/convert/log-almost-anything-with-w-b-media/log_almost_anything_with_w_b_media.py
marimo/convert/use-wandbmodelcheckpoint-in-your-keras-workflow/use_wandbmodelcheckpoint_in_your_keras_workflow.py
marimo/convert/w-b-tables-quickstart/w_b_tables_quickstart.py

Links track the head of fix_log_anything_marimo.