Run the setup notebook before the session

Notebook 00 downloads all three remote datasets and prints their shapes — (20640, 10) (6433, 14) (144, 3). Run it in Colab before the workshop.

If it fails, say so at once. A download that fails quietly leaves you stuck at sections 07 and 10, an hour in. Every other notebook loads only the data its own section needs, so you can open any one of them cold.