The long-path commits now on onboarding/next spell PM's store root extended-length (\\?\) on Windows, and _toolchain returned uv and Python under that root. Its callers run and compare those paths outside PM's own file calls, and on main they got the ordinary path. tests/pm/test_uv_python.py::test_bundled_uv_uses_a_verified_writable_python_without_changing_runtime fails on both Windows lanes for that reason. Return native() spellings; the existence checks inside still use the store's.
(cherry picked from commit acad756e33)
8d7d6334b0