Fix make clean target to safely unmount stray filesystems before deletion

Makefile

@@ -46,7 +46,15 @@ all: build deploy
 	@echo "✓ Build and deployment complete!"
 
 clean:
-	@echo "Removing build artifacts..."
+	@echo "Cleaning build artifacts..."
+	@if [ -d "$(SCRIPT_DIR)/build/rootfs" ]; then \
+		echo "Unmounting any stray mounts from $(SCRIPT_DIR)/build/rootfs..."; \
+		mount | grep "$(SCRIPT_DIR)/build/rootfs" | awk '{print $$3}' | while read mount; do \
+			echo "  Unmounting $$mount"; \
+			sudo umount -l "$$mount" 2>/dev/null || true; \
+		done; \
+	fi
+	@echo "Removing build directories..."
 	sudo rm -rf $(SCRIPT_DIR)/build/rootfs
 	sudo rm -rf $(SCRIPT_DIR)/images
 	@echo "✓ Cleaned!"