feat: add Fake News Epidemic example model

[adarshkumar23]

A research-grade simulation of misinformation spread in social networks using LLM-powered agents with 4 agent types:

• RegularCitizen: Evaluates, believes/rejects, shares news with trust-based reasoning
• Propagandist: Creates convincing fake news to advance hidden agendas
• FactChecker: Analyzes and flags misinformation, warns other agents
• NewsCreator: Legitimate journalist creating factual news

Key features:

• Evolving trust network between agents
• Critical thinking levels affecting belief thresholds
• Data collection: fake vs real news spread rates, belief rates, fact-checker accuracy
• Spread chain tracking for information cascade analysis

[coderabbitai]

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