GeezerVison

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Opening a linked worktree created from a bare repository read `core.bare` from the
common repository and discarded the worktree path.

Keep a discovered linked worktree non-bare when its administrative directory has
a `commondir` marker. The regression compares Git rev-parse behavior and verifies
Repo.bare and working_tree_dir.

Git baseline: 0bd5a6920d7c4238e0d90ddc0e7e08866e84a0f1;
environment.c:is_bare_repository() and setup.c:check_repository_format_gently().
Git 2.50.1 reports the linked checkout as non-bare.

Assisted-by: GPT 5.6
Co-authored-by: GPT 5.6 <[email protected]>

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Cygwin patches ensurepip to load setuptools and pip wheels from
`/usr/share/python-wheels`. The rolling python-pip-wheel package advanced to pip
26.2.1, which requires Python 3.10 or newer, so every Python 3.9 venv creation
failed—including the installation test's nested virtual environment.

Keep the single Cygwin lane on Python 3.9 because the regular matrix already
covers Python 3.12 and newer. Install Cygwin's setuptools wheel, download pip
26.0.1 from its immutable PyPI URL into ensurepip's shared wheel directory,
verify its SHA-256 digest, and avoid upgrading pip. This fixes all venv creation
without relying on a version that may disappear from rolling Cygwin mirrors.

Assisted-by: GPT 5.6
Co-authored-by: GPT 5.6 <[email protected]>