Interactive configuration tool for setting user preferences.
    
    Parameters:
    - output_format: "mermaid", "mcp_image", or "mcp_text"
    - theme: "default", "dark", "seaborn", "minimal", etc.
    - chart_width: Chart width in pixels
    - chart_height: Chart height in pixels  
    - reset_to_defaults: Reset all preferences to system defaults
    
    If no parameters provided, shows current configuration with sample.
    

    Render a chart from tabular data and return MCP-compatible content.
    
    Special modes:
    - chart_type="help": Returns available chart types, themes, and field suggestions
    - chart_type="suggest": Analyzes your data and suggests field mappings (requires data)

    Parameters:
    - chart_type: chart type ("line", "bar", "pie", etc.) or "help"/"suggest"
    - data: list of objects (rows) - optional for help mode
    - field_map: keys like x_field, y_field, category_field, value_field, group_field, size_field
    - config_overrides: subset of ChartConfig as dict (width, height, title, theme, dpi, etc.)
    - options: generator-specific options (e.g., smooth, stack)
    - output_format: MCP_IMAGE (PNG), MCP_TEXT (SVG), or MERMAID