The no-generation arm returned the bare store Python with a repo-only
overlay, which is worse than the main behavior it replaced: a store
Python with nothing committed is refused by _require_own_dependencies
with "hermes pm repair", and a cron script has no hermes_bootstrap to
refuse cleanly, so it runs and dies on its first third-party import. It
also stripped the overlay's site-packages entry, so
_windows_cron_bootstrap_argv warned on every spawn.
Fall through to the uv overlay instead: the handed venv keeps its own
base interpreter and its own packages, which is what worked on main.
The committed-generation arm is unchanged and still returns the store
Python with that generation's site-packages.
Also corrects the comment: site_packages is a pure path join on Windows
(pm/environments.py:250-255) and never raises there; the raise is the
pyvenv.cfg probe inside _recorded_venv:192, already covered here, and
dependency_site() is outside this try. (#123668 review)
(cherry picked from commit b3760eff7a1ea8207b0f90c4c9cbfdbc6ab753a2)
74c5832fe7