fixes

exports/iso/04-finalise/01-run.sh

@@ -93,15 +93,17 @@ GRUBEOF
 
 # Step 5: Create squashfs of the rootfs.
 # live-boot will find this at /live/filesystem.squashfs on the boot medium.
+# Ensure virtual fs mount points exist as empty dirs — live-boot bind-mounts into them.
+# Do NOT exclude them entirely or the directories won't exist in the squashfs.
+for dir in proc sys dev tmp run; do
+	rm -rf "${ROOTFS_DIR:?}/${dir}"
+	mkdir -p "${ROOTFS_DIR}/${dir}"
+done
+
 mksquashfs "${ROOTFS_DIR}" "${ISO_TEMP_DIR}/live/filesystem.squashfs" \
 	-comp xz \
 	-noappend \
-	-e boot/efi \
-	-e proc \
-	-e sys \
-	-e dev \
-	-e tmp \
-	-e run
+	-e boot/efi
 
 # Write filesystem metadata used by installers and live tools
 du -sx --block-size=1 "${ROOTFS_DIR}" | cut -f1 > "${ISO_TEMP_DIR}/live/filesystem.size"