fix: rewrite tar extract onto target volumes root when it is a cross-device symlink

Hosts like rpc-us-32 put /var/lib/docker (or volumes/) on another mount;
tar -C / then EXDEV on every var/lib/docker/volumes/... member. Canonicalize
the deepest static prefix (readlink -f /var/lib/docker/volumes) and append a
--transform after SLOWDISK_TRANSFORMS. Keying only on /var/lib/docker misses
a real docker root with volumes/ as the symlink. No-op on normal hosts.
Per-volume _data static-file offload stays on SLOWDISK_TRANSFORMS.

Co-authored-by: Cursor <cursoragent@cursor.com>

clone-node.sh

@@ -319,6 +319,17 @@ transfer_volume() {
         fi
     fi
     
+
+    # AFTER SLOWDISK_TRANSFORMS: rewrite remaining var/lib/docker/ members onto
+    # the target's real docker root when it is a cross-device symlink (see
+    # docker_root_transform in volume-utils.sh).
+    local _drt
+    _drt=$(docker_root_transform)
+    if [[ -n "$_drt" ]]; then
+        echo "Target /var/lib/docker is a symlink; appending docker-root --transform (after slowdisk)"
+        tar_extract_opts="${tar_extract_opts}${_drt}"
+    fi
+
     # Find an available port
     local port=$(find_available_port)
     if [[ $? -ne 0 ]]; then
@@ -500,6 +511,17 @@ transfer_volume_ssh() {
         fi
     fi
     
+
+    # AFTER SLOWDISK_TRANSFORMS: rewrite remaining var/lib/docker/ members onto
+    # the target's real docker root when it is a cross-device symlink (see
+    # docker_root_transform in volume-utils.sh).
+    local _drt
+    _drt=$(docker_root_transform)
+    if [[ -n "$_drt" ]]; then
+        echo "Target /var/lib/docker is a symlink; appending docker-root --transform (after slowdisk)"
+        tar_extract_opts="${tar_extract_opts}${_drt}"
+    fi
+
     echo "Using direct SSH transfer for $key (size: $((folder_size / 1048576))MB)"
     
     tar -cf - --dereference "$source_folder" 2>/dev/null | \