- Test format_success returns valid card with green theme
- Test format_error returns red theme
- Test format_info returns blue theme
- Test format with buttons includes actions element
- Test format_paginated adds [N/M] marker
- Test card has required structure (schema 2.0, config, elements)
TDD RED phase - tests will fail until implementation is added.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
