Turn your own data into interactive Tako Knowledge Card visualizations. Provide data as CSV strings and a natural language query describing what to visualize. Tako auto-selects the best chart type or you can specify one. Returns a knowledge card with chart image, interactive webpage, and embed URLs. Example: {"csv": ["quarter,revenue\nQ1,100\nQ2,200\nQ3,300"], "query": "Show revenue growth as a bar chart"}