Implemented `tests/portfolio/test_config.py` to test the `validate_config` function in `tradingagents/portfolio/config.py`.
Key improvements:
- Added `test_validate_config_max_positions_invalid` to verify `max_positions` boundary conditions (0, -1).
- Added happy path test `test_validate_config_valid`.
- Added tests for `max_position_pct`, `max_sector_pct`, `min_cash_pct`, and `default_budget` validation.
- Verified that tests correctly catch bugs by temporarily disabling validation logic.
These tests ensure the portfolio manager configuration is robustly validated before use.
Co-authored-by: aguzererler <6199053+aguzererler@users.noreply.github.com>
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