Python v1.3.1 — PyPI landing polish

Documentation and packaging polish for the HardGuard25 Python package. No code changes.

Install

```bash
pip install hardguard25
```

What's new

• Full PyPI landing page with quickstart, API reference table, sizing table, and "When NOT to Use" guardrails — so the PyPI project page stands on its own without bouncing readers to GitHub
• Root README sizing table expanded from 6 rows to the full 9-row spec set, with an entropy column and recommended defaults
• Root README excluded-letter pairings fixed to cover all 11 removed letters (added `L/1`, removed duplicate `B/D`)

Links

• PyPI: https://pypi.org/project/hardguard25/1.3.1/
• Spec: https://github.com/snapsynapse/hardguard25/blob/main/SPEC.md
• Homepage: https://hardguard25.com/