omarchy-iso-cleanup-disk: add --protected mode; adapter: doc pre-mount mount semantics

configs/airootfs/usr/local/bin/omarchy-iso-cleanup-disk

@@ -10,6 +10,13 @@
 
 set -uo pipefail
 
+if [[ ${1:-} == --protected ]]; then
+  target="${2:-}"
+  [[ -n $target ]] || { echo "Usage: $0 --protected <target>" >&2; exit 1; }
+  findmnt -R "$target" >/dev/null 2>&1 && umount -R "$target" || true
+  exit 0
+fi
+
 disk="${1:-}"
 [[ -n $disk && -b $disk ]] || { echo "Need a block device argument; got '$disk'" >&2; exit 1; }
 

configs/airootfs/usr/share/omarchy-iso/orchestrator/archinstall_adapter.py

@@ -9,7 +9,10 @@ The canonical call sequence (mirrored from archinstall.scripts.guided.py) is:
 
     FilesystemHandler(disk_config).perform_filesystem_operations()
     with Installer(mountpoint, disk_config, kernels=, silent=) as inst:
-        inst.mount_ordered_layout()
+        # guided.py:84-85 SKIPS this for DiskLayoutType.Pre_mount — pre-mounted
+        # configs do their own mounting before the Installer context opens.
+        if disk_config.config_type != DiskLayoutType.Pre_mount:
+            inst.mount_ordered_layout()
         inst.sanity_check(offline=, skip_ntp=, skip_wkd=)
         inst.generate_key_files()                     # encrypted only
         inst.set_mirrors(handler, mirror_config, on_target=False)