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- 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>