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Students hit "No module named 'tinytorch.core.tensor'" in notebooks because the Jupyter kernel used a different Python than where tinytorch was installed. - setup: install ipykernel + nbdev, register named kernel during tito setup - health: add Notebook Readiness checks (import, kernel, Python match) - export: verify exported file exists and has content (fail loudly) - Windows: add get_venv_bin_dir() helper for cross-platform venv paths