Update requirements.txt

requirements.txt

@@ -16,3 +16,8 @@ langgraph==0.2.34
 aiosqlite==0.20.0
 
 langgraph-checkpoint-sqlite==2.0.11
+geopandas==0.14.4
+shapely==2.0.4
+pyproj==3.6.1
+pyogrio==0.9.0      # use as the read/write engine (fewer GDAL headaches than Fiona)
+rtree==1.2.0        # optional: spatial index; skip if you don't use sindex