ci: add multi-version Python testing and status banners

- Separate lint job for ruff and mypy checks on Python 3.13
- Add pytest matrix strategy to test Python 3.9 through 3.14
- Add GitHub Actions status badge to README
- Document CI/CD pipeline and what each check does
- Include pass/fail criteria for linting, type checking, and testing
- Link to Actions tab for detailed workflow results

.github/workflows/tests.yml

@@ -5,8 +5,34 @@ on:
   pull_request:
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install uv
+        run: python -m pip install --upgrade pip uv==0.9.28
+
+      - name: Install dev dependencies
+        run: |
+          uv venv .venv
+          uv pip install --python .venv/bin/python ".[dev]"
+
+      - name: Run ruff
+        run: .venv/bin/ruff check hate_crack
+
+      - name: Run mypy
+        run: .venv/bin/mypy hate_crack
+
   pytest:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -14,7 +40,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: ${{ matrix.python-version }}
 
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y p7zip-full transmission-cli
@@ -27,12 +53,6 @@ jobs:
           uv venv .venv
           uv pip install --python .venv/bin/python ".[dev]"
 
-      - name: Run ruff
-        run: .venv/bin/ruff check hate_crack
-
-      - name: Run mypy
-        run: .venv/bin/mypy hate_crack
-
       - name: Run tests
         env:
           HATE_CRACK_RUN_E2E: "0"