Add omarchy-iso disk-cleanup and archinstall-patch bash helpers

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

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+#!/bin/bash
+#
+# Clean up any holders / mounts / LVM / crypt devices on the install disk
+# before archinstall starts wiping. Idempotent — called once per install attempt
+# from the orchestrator's cleanup_disk phase.
+#
+# Ported verbatim from .automated_script.sh's cleanup_install_disk(). Kept in
+# bash because lsblk / findmnt / lvm / cryptsetup are all easier to drive
+# here than from Python.
+
+set -uo pipefail
+
+disk="${1:-}"
+[[ -n $disk && -b $disk ]] || { echo "Need a block device argument; got '$disk'" >&2; exit 1; }
+
+echo "Cleaning up existing holders on install disk: $disk"
+findmnt -R /mnt >/dev/null && umount -R /mnt || true
+
+while read -r dev; do
+  [[ -b $dev ]] || continue
+  swapoff "$dev" 2>/dev/null || true
+  while read -r target; do
+    [[ -n $target ]] && umount "$target" 2>/dev/null || true
+  done < <(findmnt -rn -S "$dev" -o TARGET 2>/dev/null || true)
+done < <(lsblk -rnpo PATH "$disk")
+
+while read -r dev type; do
+  [[ $type == disk || $type == part || $type == crypt ]] || continue
+  while read -r vg; do
+    [[ -n $vg ]] && vgchange -an "$vg" 2>/dev/null || true
+  done < <(pvs --noheadings -o vg_name "$dev" 2>/dev/null | awk '{$1=$1; print}' | sort -u)
+done < <(lsblk -rnpo PATH,TYPE "$disk")
+
+while read -r dev type; do
+  [[ $type == crypt ]] && cryptsetup close "$dev" 2>/dev/null || true
+done < <(lsblk -rnpo PATH,TYPE "$disk")
+
+blockdev --flushbufs "$disk" 2>/dev/null || true
+partprobe "$disk" 2>/dev/null || true
+udevadm settle || true

configs/airootfs/usr/local/bin/omarchy-iso-patch-archinstall

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+#!/bin/bash
+#
+# Patch upstream archinstall in place for two Python 3.14 / archinstall 4.3
+# bugs that hit our flow:
+#
+# 1. logfile_target join: '/' on an absolute Path with another absolute Path
+#    raises. Strip leading slash so the join produces target / "var/log/..."
+#    instead of throwing.
+#
+# 2. Limine EFI copy: archinstall passes the destination directory but limine
+#    .copy() expects the destination file path. Two sites: limine_x64.efi
+#    copy and limine-bios.sys copy.
+#
+# Idempotent: re-running is a no-op (sed only matches the buggy form). Carry
+# this until upstream Arch's packaged archinstall has the fixes.
+
+set -eEo pipefail
+
+target="/usr/lib/python3.14/site-packages/archinstall/lib/installer.py"
+[[ -f $target ]] || { echo "archinstall installer.py not found at $target" >&2; exit 1; }
+
+sed -i \
+  -e 's|logfile_target = self\.target / absolute_logfile$|logfile_target = self.target / absolute_logfile.relative_to("/")|' \
+  -e 's|(limine_path / file)\.copy(efi_dir_path)|(limine_path / file).copy(efi_dir_path / file)|' \
+  -e "s|(limine_path / 'limine-bios.sys')\.copy(boot_limine_path)|(limine_path / 'limine-bios.sys').copy(boot_limine_path / 'limine-bios.sys')|" \
+  "$target"