Closes#434
## Summary
Adds Pydantic-based validation at agent input/output boundaries to:
- Catch validation errors early with clear error messages
- Provide strict schema enforcement for agent outputs
- Support graceful fallback when validation fails
## Changes
1. **New module: **
- — validates analyst output with minimum length checks
- — validates research debate state
- — validates risk management debate state
- — validates final trade decisions (BUY/SELL/HOLD)
- — validates agent input (ticker, date format)
- — strict validation (raises on error)
- — graceful fallback (adds error field)
2. **Updated **
- Added conditional import of validation helpers
- flag for feature detection
3. **Added to dependencies**
4. **Example: **
- Shows how to wrap existing analyst with validation
## Design Decisions
- **Safe by default**: Uses which never raises
- **Optional**: Validation is import-guarded; code works without pydantic
- **Non-breaking**: Existing code continues to work; validation is additive
- **Clear errors**: Validation messages explain exactly what failed
## Testing
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