Update AGENTS.md

Author: kosiew

AGENTS.md

@@ -35,6 +35,10 @@ This repository contains Python bindings for Rust's DataFusion.
   - `udwf` (window)
   - `udtf` (table)
 - `python/datafusion/col.py` exposes the `Col` helper with `col` and `column` instances for building column expressions using attribute access.
+- `python/datafusion/catalog.py` provides Python-based catalog and schema providers.
+- `python/datafusion/object_store.py` exposes object store connectors: `AmazonS3`, `GoogleCloud`, `MicrosoftAzure`, `LocalFileSystem`, and `Http`.
+- `python/datafusion/unparser.py` converts logical plans back to SQL via the `Dialect` and `Unparser` classes.
+- `python/datafusion/dataframe_formatter.py` offers configurable HTML and string formatting for DataFrames (replaces the deprecated `html_formatter.py`).
 - `python/tests/generic.py` includes utilities for test data generation:
   - `data`
   - `data_with_nans`