- Updated set_active() method to require status='pending' in addition to ZIP upload completion
- Added comprehensive documentation for new active status criteria
- Updated CHANGELOG.md with version 1.2.3 details
- Enhanced README.md with active status requirements documentation

Active status now requires:
1. ZIP upload status = 'completed'
2. ZIP checksum present
3. Match status = 'pending'

This provides more precise control over match activation workflow.