Check output cells of notebooks

nb-output-exists.sh

@@ -0,0 +1,11 @@
+for notebook in docs/examples/*.ipynb; do
+    # Check the notebook for null execution counts
+    if ! jq -e '.cells | map(select(.cell_type == "code") | .execution_count != null) | all' "$notebook" > /dev/null; then
+        echo "Error: $notebook has code cells with null execution counts."
+        exit 1
+    fi
+done
+
+# If all notebooks are valid
+echo "All notebooks have valid execution counts."
+exit 0