hogbom_clean issues (Feb 2026 review)

[aakepley]

• missing colab link
• notebook introduction is no longer correct because we are downloading pre-made images from casa rather than running casa in the notebook.
• will need to add a toolviper install to get notebook to work in colab.
• will need to add an astroviper install early to get the notebook to work in colab.
• attempt to install astroviper in notebook on colab generates an error:
  Installing collected packages: asciitree, jmespath, fsspec, fasteners, deprecated, aioitertools, numcodecs, botocore, zarr, aiobotocore, xradio, s3fs, graphviper, astroviper Attempting uninstall: fsspec Found existing installation: fsspec 2025.3.0 Uninstalling fsspec-2025.3.0: Successfully uninstalled fsspec-2025.3.0 ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts. datasets 4.0.0 requires fsspec[http]<=2025.3.0,>=2023.1.0, but you have fsspec 2026.2.0 which is incompatible. gcsfs 2025.3.0 requires fsspec==2025.3.0, but you have fsspec 2026.2.0 which is incompatible. Successfully installed aiobotocore-3.2.0 aioitertools-0.13.0 asciitree-0.3.3 astroviper-0.0.34 botocore-1.42.55 deprecated-1.3.1 fasteners-0.20 fsspec-2026.2.0 graphviper-0.0.38 jmespath-1.1.0 numcodecs-0.15.1 s3fs-2026.2.0 xradio-1.1.1 zarr-2.18.7