Reduce xdist worker count to 2 on Windows (#243)

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: strawgate <[email protected]>

Author: Copilot

.github/workflows/test.yml

@@ -141,20 +141,30 @@ jobs:
       - name: "Install uv"
         uses: astral-sh/setup-uv@v6
 
+      - name: "Set pytest worker count"
+        id: pytest-workers
+        run: |
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            echo "count=2" >> $GITHUB_OUTPUT
+          else
+            echo "count=auto" >> $GITHUB_OUTPUT
+          fi
+        shell: bash
+
       - name: "Install latest dependencies"
         run: uv sync --locked --group dev --python ${{ matrix.python-version }}
         working-directory: ${{ matrix.project }}
 
       - name: "Test with latest dependencies"
-        run: uv run pytest tests . -vv
+        run: uv run pytest tests . -vv -n ${{ steps.pytest-workers.outputs.count }}
         working-directory: ${{ matrix.project }}
 
       - name: "Install oldest dependencies"
         run: uv sync --group dev --python ${{ matrix.python-version }} --resolution lowest-direct
         working-directory: ${{ matrix.project }}
 
       - name: "Test with oldest dependencies"
-        run: uv run pytest tests . -vv
+        run: uv run pytest tests . -vv -n ${{ steps.pytest-workers.outputs.count }}
         working-directory: ${{ matrix.project }}
 
       - name: "Build"
@@ -192,20 +202,30 @@ jobs:
       - name: "Install uv"
         uses: astral-sh/setup-uv@v6
 
+      - name: "Set pytest worker count"
+        id: pytest-workers
+        run: |
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            echo "count=2" >> $GITHUB_OUTPUT
+          else
+            echo "count=auto" >> $GITHUB_OUTPUT
+          fi
+        shell: bash
+
       - name: "Install latest dependencies"
         run: uv sync --locked --group dev --python ${{ matrix.python-version }}
         working-directory: ${{ matrix.project }}
 
       - name: "Test with latest dependencies"
-        run: uv run pytest tests . -vv
+        run: uv run pytest tests . -vv -n ${{ steps.pytest-workers.outputs.count }}
         working-directory: ${{ matrix.project }}
 
       - name: "Install oldest dependencies"
         run: uv sync --group dev --python ${{ matrix.python-version }} --resolution lowest-direct
         working-directory: ${{ matrix.project }}
 
       - name: "Test with oldest dependencies"
-        run: uv run pytest tests . -vv
+        run: uv run pytest tests . -vv -n ${{ steps.pytest-workers.outputs.count }}
         working-directory: ${{ matrix.project }}
 
       - name: "Build"