- Add policy for managing NaN values in UNRATE series to AGENTS.md.
- Update README.md with new chart script details and usage instructions.
- Modify `lagged_oil_unrate_chart_styled.py` to implement clamping to last valid index for UNRATE data.
- Introduce new script `bitcoin_m2_chart.py` for Bitcoin vs. global M2 overlay chart.
- Ensure all scripts maintain data integrity by avoiding estimates for current month.
- Updated import statements in `bitcoin_m2_chart.py` and `custom_chart.py` to use a simplified path for `fetch_series_db` and `save_figure`.
- Removed obsolete `chart.png` file from outputs.
- Made changes to `fred.db`, indicating updates to the database content.