Split lint into its own job on Python 3.14

Flake8 must run on a Python that supports all syntax in the codebase
(e.g. except* requires 3.11+). The test matrix still covers 3.10+.

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

Author: Technologicat

.github/workflows/python-package.yml

@@ -12,8 +12,28 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6
+    - name: Set up Python
+      uses: actions/setup-python@v6
+      with:
+        # Use latest Python so flake8 can parse all syntax (e.g. except* requires 3.11+)
+        python-version: "3.14"
+    - name: Install flake8
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --config=flake8rc --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --config=flake8rc --count --exit-zero --max-complexity=100 --max-line-length=127 --statistics
 
+  test:
+    needs: lint
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -28,14 +48,7 @@ jobs:
     - name: Install tools in CI venv
       run: |
         python -m pip install --upgrade pip
-        pip install flake8
         pip install pdm
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --config=flake8rc --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --config=flake8rc --count --exit-zero --max-complexity=100 --max-line-length=127 --statistics
     - name: Determine Python version string for PDM
       run: |
         echo "TARGET_PYTHON_VERSION_FOR_PDM=${{ matrix.python-version }}" | tr - @ >> "$GITHUB_ENV"