Issue: The landing page template supported displaying product descriptions,
but the Product model didn't load the description field from config.yaml files.
Changes:
- Added optional 'description' parameter to Product.__init__()
- Updated Product.to_dict() to include description (if present)
- Updated Product.from_dict() to load description from config
- Added test to verify descriptions are displayed on landing page
All 9 landing page tests passing.
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Co-Authored-By: Claude <noreply@anthropic.com>