ci: add Python version matrix (3.10-3.14) to tool tests job (#370)

- Add strategy matrix covering Python 3.10, 3.11, 3.12, 3.13, and 3.14 to python-tests job
- Ensure continuous test coverage from documented floor (3.10) to latest Python version (3.14)

.github/workflows/ci.yml

@@ -62,13 +62,17 @@ jobs:
       - run: python tools/security_guards.py
 
   python-tests:
-    name: Python tool tests
+    name: Python tool tests (Python ${{ matrix.python-version }})
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
-          python-version: "3.12"
+          python-version: ${{ matrix.python-version }}
       - run: python -m unittest discover -s tests -t . -v
 
   dependency-review: