Add GitHub Actions workflows for testing and linting

- Set up GitHub Actions workflows for Python testing and linting
- Add support for Python 3.12 in test matrix and classifiers
- Run tests on multiple Python versions (3.7 through 3.12)
- Configure linting with flake8, black, and mypy

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: coderberry

.github/workflows/python-lint.yml

@@ -0,0 +1,35 @@
+name: Python Linting
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.12'
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -e .[dev]
+    
+    - name: Lint with flake8
+      run: |
+        flake8 blockdoc tests
+    
+    - name: Check formatting with black
+      run: |
+        black --check blockdoc tests
+    
+    - name: Type check with mypy
+      run: |
+        mypy blockdoc

.github/workflows/python-tests.yml

@@ -0,0 +1,36 @@
+name: Python Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -e .[dev]
+    
+    - name: Run tests with pytest
+      run: |
+        python -m pytest --cov=blockdoc
+    
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        fail_ci_if_error: false

setup.py

@@ -30,6 +30,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Text Processing :: Markup",
     ],