ci: add shell quality checks

.github/workflows/ci.yml

@@ -37,3 +37,24 @@ jobs:
       - name: Lint Bash
         run: shellcheck --severity=warning $(git ls-files '*.sh')
 
+  python:
+    name: Python tests and compilation
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/setup-python@82c7e631bb3cdc910f68e0081d67478d79c6982d # v5.6.0
+        with:
+          python-version: '3.12'
+      - name: Compile Python sources
+        run: python -m compileall -q scripts shared
+      - name: Run Python tests
+        run: |
+          set -euo pipefail
+          for file in scripts/test-*.py; do
+            echo "==> $file"
+            python "$file"
+          done
+      - name: Validate generated configuration
+        run: python scripts/validate-config.py generated/codex-powershell/config.toml generated/claude-powershell/settings.json
+