ci: pin Python version to 3.13.5 across all workflows

- Update all GitHub Actions workflows to use Python 3.13.5 specifically
- Replace flexible '3.13' with exact '3.13.5' version pinning
- Update pyproject.toml requires-python and classifiers to match
- Align CI/CD with local development environment (Python 3.13.5)
- Prevent Dependabot from testing with newer Python versions like 3.13.12

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

@@ -20,7 +20,7 @@ jobs:
     
     strategy:
       matrix:
-        python-version: [3.13]
+        python-version: [3.13.5]
     
     steps:
     - name: Checkout code