Implement CrewAI Agents & RAG with LlamaIndex

Implement the CrewAI team, defining agents with GPT-5 Pro and Claude Sonnet 4 as their respective LLM backends (e.g., GPT-5 for strategic, Claude Sonnet 4 for creative critique). Integrate LlamaIndex for RAG to provide agents with access to simulated 'market_data', 'user_analytics', and 'cost_analysis' datasets. Set up their communication flow.