feat: Add OpenSSF Scorecard badge to README

Added OpenSSF Scorecard badge to display security score:
- Badge displays automated security assessment results
- Links to OpenSSF Scorecard viewer for detailed metrics
- Positioned after codecov badge for logical grouping

CI/CD Enhancement Summary:
- ✅ CodeQL security scanning (already existed)
- ✅ Tests with Codecov integration (already existed)
- ✅ PyPI publish workflow (already existed)
- ✅ OpenSSF Scorecard workflow (already existed)
- ✅ OpenSSF Scorecard badge (NEW - added to README)

All CI/CD infrastructure is now complete and properly showcased
in the README with comprehensive badges.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: GeneAI

README.md

@@ -7,6 +7,7 @@
 [![Python 3.10+](https://img.shields.io/pypi/pyversions/empathy.svg)](https://www.python.org/downloads/)
 [![Tests](https://github.com/Smart-AI-Memory/empathy/actions/workflows/tests.yml/badge.svg)](https://github.com/Smart-AI-Memory/empathy/actions/workflows/tests.yml)
 [![codecov](https://codecov.io/gh/Smart-AI-Memory/empathy/branch/main/graph/badge.svg)](https://codecov.io/gh/Smart-AI-Memory/empathy)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/Smart-AI-Memory/empathy/badge)](https://securityscorecards.dev/viewer/?uri=github.com/Smart-AI-Memory/empathy)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![Downloads](https://img.shields.io/pypi/dm/empathy.svg)](https://pypi.org/project/empathy/)