Publish v0.5.0 to PyPI and create first GitHub Release

[gn00295120]

Background

trend-pulse is not yet on PyPI. Publishing to PyPI enables pip install trend-pulse and significantly increases discoverability and ease of installation.

Steps

1. Ensure pyproject.toml has correct metadata (name, version, description, URLs)
2. Add classifiers (Development Status, License, Python versions)
3. Build: python -m build
4. Upload to PyPI: twine upload dist/*
5. Create GitHub Release for v0.5.0 with installation instructions
6. Verify: pip install trend-pulse works from a clean venv

Acceptance Criteria

• Package available on PyPI as trend-pulse
• pip install trend-pulse works
• GitHub Release v0.5.0 exists with install instructions
• PyPI page shows correct metadata and description