Fix numpy cibuildwheel: patch cpython-freethreading, unify platforms

- Patch numpy 2.4.x pyproject.toml to remove the "cpython-freethreading"
  enable group, which is invalid in cibuildwheel v4.0 (fixed on numpy
  main but not yet released).
- Consolidate Linux/Windows numpy builds into a single cibuildwheel step,
  matching how cuda.core and cuda.bindings are built.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: leofang

.github/workflows/build-wheel.yml

@@ -257,30 +257,31 @@ jobs:
             mv "/c/Program Files/Git/usr/bin/link.exe" "/c/Program Files/Git/usr/bin/link.exe.bak"
           fi
 
-      - name: Download numpy sdist (pre-release Python)
-        if: ${{ startsWith(matrix.python-version, '3.15') && startsWith(inputs.host-platform, 'linux') }}
+      - name: Download and patch numpy sdist (pre-release Python)
+        if: ${{ startsWith(matrix.python-version, '3.15') }}
         run: |
           pip download --no-binary numpy --no-deps "numpy>=1.21.1" -d numpy-sdist/
           cd numpy-sdist && tar xf numpy-*.tar.gz && rm numpy-*.tar.gz
+          # WAR: numpy 2.4.x ships enable=["cpython-freethreading", ...] which
+          # is invalid in cibuildwheel v4.0 (freethreading is now on by default).
+          # Fixed on numpy main (a5df4859) but not yet released.
+          sed -i 's/"cpython-freethreading", //' numpy-*/pyproject.toml
           echo "NUMPY_SRC_DIR=$(pwd)/$(ls -d numpy-*/)" >> $GITHUB_ENV
 
-      - name: Build numpy wheel (pre-release Python, Linux)
-        if: ${{ startsWith(matrix.python-version, '3.15') && startsWith(inputs.host-platform, 'linux') }}
+      - name: Build numpy wheel (pre-release Python)
+        if: ${{ startsWith(matrix.python-version, '3.15') }}
         uses: pypa/cibuildwheel@54327ab9d35de03b359ac25c97de9417d94639c0  # v4.0.0rc1
         env:
           CIBW_BUILD: ${{ env.CIBW_BUILD }}
           CIBW_ARCHS_LINUX: "native"
           CIBW_BUILD_VERBOSITY: 1
+          CIBW_BEFORE_BUILD_WINDOWS: "pip install delvewheel"
+          CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: "delvewheel repair -w {dest_dir} {wheel}"
           CIBW_ENABLE: "cpython-prerelease"
         with:
           package-dir: ${{ env.NUMPY_SRC_DIR }}
           output-dir: numpy-wheel/
 
-      - name: Build numpy wheel (pre-release Python, Windows)
-        if: ${{ startsWith(matrix.python-version, '3.15') && startsWith(inputs.host-platform, 'win') }}
-        run: |
-          pip wheel "numpy>=1.21.1" --no-binary numpy -w numpy-wheel/
-
       - name: Upload numpy wheel
         if: ${{ startsWith(matrix.python-version, '3.15') }}
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1