Add 47 integration tests covering:
- Agent state structures (InvestDebateState, RiskDebateState, AgentState)
- Conditional logic for analyst tool calls and debate flow
- Propagator state initialization and configuration
- Graph setup with various analyst combinations
- End-to-end workflow state transitions
- Validation integration with TradingAgentsGraph
Tests verify:
- State creation and mutation
- Debate round progression (Bull/Bear, Risk analysts)
- Graph compilation with different analyst configurations
- Input validation for tickers and dates
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Co-Authored-By: Claude <noreply@anthropic.com>