Clarify Windows ARM64 wheel testing

Explicitly select ARM64 wheels on the Windows ARM runner and document why its minimal environment still runs the same decoder smoke test as every platform.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: chinazhangchao

.github/workflows/pypi-build-artifacts.yml

@@ -39,6 +39,7 @@ jobs:
         os: [ ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-15-intel, macos-latest ]
         include:
           - os: windows-11-arm
+            windows_archs: "ARM64"
             before_test: "uv pip install pytest==9.1.1"
             test_command: "python -m pytest --confcutdir={project}/tests/avro {project}/tests/avro/test_decoder.py"
 
@@ -80,11 +81,13 @@ jobs:
         env:
           # Ignore 32 bit architectures
           CIBW_ARCHS: "auto64"
+          CIBW_ARCHS_WINDOWS: ${{ matrix.windows_archs || 'auto64' }}
           CIBW_PROJECT_REQUIRES_PYTHON: ">=3.10,<3.15"
           # Keep these in sync with Python CI job `cibw-dev-env-smoke-test`
           # in .github/workflows/python-ci.yml to catch import-time regressions early.
-          # PyArrow does not publish Windows ARM64 wheels, so that runner uses
-          # the minimal test environment configured in the matrix.
+          # Every platform runs the decoder wheel smoke test. PyArrow does not
+          # publish Windows ARM64 wheels, so that runner uses a minimal test
+          # environment and avoids loading the repository-wide conftest.
           CIBW_BEFORE_TEST: ${{ matrix.before_test || 'uv sync --directory {project} --only-group dev --no-install-project' }}
           CIBW_TEST_COMMAND: ${{ matrix.test_command || 'uv run --directory {project} pytest tests/avro/test_decoder.py' }}
           # Skip free-threaded (PEP 703) builds until we evaluate decoder_fast support

.github/workflows/svn-build-artifacts.yml

@@ -39,6 +39,7 @@ jobs:
         os: [ ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-15-intel, macos-latest ]
         include:
           - os: windows-11-arm
+            windows_archs: "ARM64"
             before_test: "uv pip install pytest==9.1.1"
             test_command: "python -m pytest --confcutdir={project}/tests/avro {project}/tests/avro/test_decoder.py"
 
@@ -74,9 +75,11 @@ jobs:
         env:
           # Ignore 32 bit architectures
           CIBW_ARCHS: "auto64"
+          CIBW_ARCHS_WINDOWS: ${{ matrix.windows_archs || 'auto64' }}
           CIBW_PROJECT_REQUIRES_PYTHON: ">=3.10,<3.15"
-          # PyArrow does not publish Windows ARM64 wheels, so that runner uses
-          # the minimal test environment configured in the matrix.
+          # Every platform runs the decoder wheel smoke test. PyArrow does not
+          # publish Windows ARM64 wheels, so that runner uses a minimal test
+          # environment and avoids loading the repository-wide conftest.
           CIBW_BEFORE_TEST: ${{ matrix.before_test || 'uv sync --directory {project} --only-group dev --no-install-project' }}
           CIBW_TEST_COMMAND: ${{ matrix.test_command || 'uv run --directory {project} pytest tests/avro/test_decoder.py' }}
           # Skip free-threaded (PEP 703) builds until we evaluate decoder_fast support