Drop CIBW_REPAIR_WHEEL_COMMAND_WINDOWS override; version-gate matplotlib/cffi

Remove the empty CIBW_REPAIR_WHEEL_COMMAND_WINDOWS that was overriding the
pyproject.toml delvewheel config. The pyproject.toml already specifies
`delvewheel repair --namespace-pkg cuda` which is the correct behavior.

Keep matplotlib and cffi as test dependencies but gate them to
python_version < 3.15 (no wheels available yet for 3.15).

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

Author: leofang

.github/workflows/build-wheel.yml

@@ -174,10 +174,6 @@ jobs:
           # no-op for stable Python versions because CIBW_BUILD still filters
           # the target version.
           CIBW_ENABLE: cpython-prerelease
-          # v4.0 made delvewheel the default Windows repair command. We rely
-          # on cuda.pathfinder for runtime DLL discovery, so preserve the
-          # previous behaviour (no automatic DLL bundling) for now.
-          CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: ""
           # CIBW mounts the host filesystem under /host
           CIBW_ENVIRONMENT_LINUX: >
             CUDA_PATH=/host/${{ env.CUDA_PATH }}
@@ -246,10 +242,6 @@ jobs:
           # no-op for stable Python versions because CIBW_BUILD still filters
           # the target version.
           CIBW_ENABLE: cpython-prerelease
-          # v4.0 made delvewheel the default Windows repair command. We rely
-          # on cuda.pathfinder for runtime DLL discovery, so preserve the
-          # previous behaviour (no automatic DLL bundling) for now.
-          CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: ""
           # CIBW mounts the host filesystem under /host
           CIBW_ENVIRONMENT_LINUX: >
             CUDA_PATH=/host/${{ env.CUDA_PATH }}
@@ -502,10 +494,6 @@ jobs:
           # no-op for stable Python versions because CIBW_BUILD still filters
           # the target version.
           CIBW_ENABLE: cpython-prerelease
-          # v4.0 made delvewheel the default Windows repair command. We rely
-          # on cuda.pathfinder for runtime DLL discovery, so preserve the
-          # previous behaviour (no automatic DLL bundling) for now.
-          CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: ""
           # CIBW mounts the host filesystem under /host
           CIBW_ENVIRONMENT_LINUX: >
             CUDA_PATH=/host/${{ env.CUDA_PATH }}

cuda_bindings/pyproject.toml

@@ -46,6 +46,7 @@ all = [
 test = [
     "cython>=3.2,<3.3",
     "setuptools>=77.0.0",
+    "matplotlib>=3.5.0; python_version < '3.15'",
     "numpy>=1.21.1",
     "pytest>=6.2.4",
     "pytest-benchmark>=3.4.1",

cuda_core/pyproject.toml

@@ -58,7 +58,7 @@ cu12 = ["cuda-bindings[all]==12.*", "cuda-toolkit==12.*"]
 cu13 = ["cuda-bindings[all]==13.*", "cuda-toolkit==13.*"]
 
 [dependency-groups]
-test = ["cython>=3.2,<3.3", "setuptools", "pytest>=6.2.4", "pytest-benchmark", "pytest-randomly", "pytest-repeat", "pytest-rerunfailures", "pytest-timeout", "cloudpickle", "psutil"]
+test = ["cython>=3.2,<3.3", "setuptools", "pytest>=6.2.4", "pytest-benchmark", "pytest-randomly", "pytest-repeat", "pytest-rerunfailures", "pytest-timeout", "cloudpickle", "psutil", "cffi; python_version < '3.15'"]
 ml-dtypes = ["ml-dtypes>=0.5.4,<0.6.0"]
 test-cu12 = [ {include-group = "ml-dtypes" }, {include-group = "test" }, "cupy-cuda12x; python_version < '3.14'", "cuda-toolkit[cudart]==12.*"]  # runtime headers needed by CuPy
 test-cu13 = [ {include-group = "ml-dtypes" }, {include-group = "test" }, "cupy-cuda13x; python_version < '3.14'", "cuda-toolkit[cudart]==13.*"]  # runtime headers needed by CuPy