v1.5.1

Patch release for repository and CI cleanup.\n\nChanged:\n- Added explicit read-only GitHub Actions token permissions to Test, Smoke, and Security workflows.\n- Published nightly smoke INDEX.md content into the GitHub Actions job summary.\n- Bumped scanner patch version to 1.5.1.\n\nFixed:\n- Removed generated Python bytecode from source control and ignored future pycache / .pyc artifacts.\n- Corrected the canonical scanner synopsis to use Scan-PythonPackages.ps1.\n- Made scanner venv bootstrap upgrades use python -m pip so pip/setuptools/wheel updates are not rejected by the pip.exe wrapper.\n\nVerification:\n- Local fixture generation: passed, 31 fixtures.\n- Local Pester: 47 passed, 0 failed.\n- Local smoke harness: passed.\n- GitHub Test, Smoke, Security, and CodeQL: passed.