ci: align Python version support to 3.13 only

- Update CI/CD workflows to test only Python 3.13
- Remove Python 3.11 and 3.12 from test matrix
- Update package classifiers to reflect Python 3.13 only support
- Align with requires-python = '>=3.13' constraint

.github/workflows/cli-level1-tests.yml

@@ -20,7 +20,7 @@ jobs:
     
     strategy:
       matrix:
-        python-version: [3.11, 3.12, 3.13]
+        python-version: [3.13]
     
     steps:
     - name: Checkout code