Add RIVERS_PATH and BUILDINGS_PATH to execute_python_code docstring so agent knows about them

chatbot/agentic_rag/tools.py

@@ -81,6 +81,8 @@ def execute_python_code(code: str) -> str:
     Use this tool to execute arbitrary Python code for spatial reasoning and data analysis.
     SCHEMA GUIDE:
     - Primary dataset: `LAKES_PATH` (A pre-defined global variable containing the path to the geopackage).
+    - River dataset: `RIVERS_PATH` (Contains river network with 'river_id' and 'geometry').
+    - Buildings dataset: `BUILDINGS_PATH` (Contains structures with 'geometry').
     - Dataset CRS: ESRI:102025 (Asia North Albers, units=meters).
     - Elevation Columns: Use 'Elevation' or 'surface_elevation_m' for lake elevation.
     - LAKE TYPE MAPPING: Use 'lake_type' column with these codes: