feat: add Stock Market with Rumors example model

[adarshkumar23]

A simulation of market dynamics with information asymmetry using LLM-powered agents with 4 agent types:

• RetailTrader: Trades based on public info, rumors, and analyst reports
• InsiderTrader: Manipulates prices through planted rumors (pump & dump)
• Analyst: Publishes research reports influencing market sentiment
• MarketMaker: Provides liquidity to stabilize extreme volatility

Key features:

• Live price engine driven by supply/demand from agent trading
• Rumor propagation system with manipulation tracking
• Analyst report publishing and influence mechanics
• Bubble detection (30%+ price increase over 5 steps)
• 3 stocks: TECH, HEALTH, ENERGY with different volatility profiles
• Data collection: prices, volume, volatility, insider profits, bubbles

[coderabbitai]

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