Crew Setup and Agent Definition

Initialize a CrewAI `Crew` and define three agents: a `Market Data Analyst`, a `Trend Spotter`, and a `Report Generator`. Assign each agent a clear role, backstory, and specific goals related to analyzing prediction markets. Utilize Gemini 2.5 Pro as the LLM for all agents. Define a custom `Tool` for the `Market Data Analyst` that simulates fetching historical prediction market data (e.g., `fetch_market_data(market_name, start_date, end_date)`).