- Add sha256 field to Windows PythonConfiguration (PyPy/GraalPy have
direct download URLs on Windows too)
- Pass sha256 to install_pypy() and install_graalpy() in windows.py
- Fix update_pythons.py: handle empty sha256 from CPython API (older
versions) by streaming download to compute it; fix condition to
check 'not sha256' rather than 'not in dict'
- Fix update_virtualenv.py: compute sha256 even when version unchanged
but sha256 is empty (first-time population)
- Fix update_python_build_standalone.py: resolve file path relative to
the script itself (not the installed package) so writes go to source
checkout, not the uv cache
- Populate actual sha256 values by running all three update scripts
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Assisted-by: copilot-cli:claude-sonnet-4.6
