Add new skill for generating charts and data visualizations using Python matplotlib.
Features:
- Line charts (time series)
- Bar charts
- Pie charts
- Dual-line comparison charts
- Heatmaps
- JSON data loading
Uses `uv run --with matplotlib` for zero-install Python charting.
Includes dark theme optimized for chat interfaces.
🤖 AI-assisted: This skill was developed with Claude assistance.
Testing: Fully tested with real-world alert data visualization.
