Adds two primary modes on top of the original LLM-generation approach:
- Mode 1: pyfiglet (571 fonts, pip install, no API key) for text banners
- Mode 2: asciiart.eu search (11,000+ pieces) via web_extract for pre-made art
- Mode 3: LLM-generated art using Unicode palette (original PR, now fallback)
Includes decision flow, font recommendations, and category reference.
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