build(ci): add Windows x86_64 wheel to release pipeline (#345)

* build(ci): add Windows x86_64 wheel to release pipeline

Add windows-latest / x86_64-pc-windows-msvc to the release workflow
matrix so PyPI receives a Windows wheel alongside the existing Linux
and macOS wheels.

The stage_clib.sh script already handles Windows naming conventions
(.exe, .dll, .lib) via the MINGW case, and patch_pyproject_data.py
uses pathlib which is cross-platform.

Closes #270

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* ci: add Rust toolchain setup and explicit bash shell for Windows builds

Add dtolnay/rust-toolchain@stable and Swatinem/rust-cache@v2 steps to
ensure cargo is available on all platforms (including Windows). Also add
explicit shell: bash to the "Build CLI + C library" step so just can
find a POSIX shell on Windows runners.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: weinbe58

.github/workflows/release.yml

@@ -30,11 +30,17 @@ jobs:
             target: x86_64-apple-darwin
           - os: macos-14
             target: aarch64-apple-darwin
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
     runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v6
 
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+
       - name: Install uv
         uses: astral-sh/setup-uv@v7
 
@@ -50,6 +56,7 @@ jobs:
       # runs, so they get included in the wheel via data = "dist-data".
       - name: Build CLI + C library
         if: ${{ !startsWith(matrix.target, 'aarch64-unknown-linux') }}
+        shell: bash
         run: just build-cli stage-clib
 
       # For Linux aarch64 cross-compilation, the CLI crate must be
@@ -74,6 +81,7 @@ jobs:
         run: uv run python scripts/patch_pyproject_data.py patch
 
       # manylinux_2_28 targets glibc 2.28+ (AlmaLinux 8 / Ubuntu 20.04+).
+      # Ignored on non-Linux platforms.
       - name: Build wheel
         uses: PyO3/maturin-action@v1
         with: