story_structure keys: ['version', 'generated_at', 'story_graph', 'reachability', 'completeness', 'choice_analysis', 'save_points', 'diagnostics']
story_structure length: 8
First 5 keys: ['version', 'generated_at', 'story_graph', 'reachability', 'completeness']
story_structure type: <class 'dict'>
