Two fixes: (1) Search entire ISO for grub.cfg content instead of only at
2048-byte sector boundaries — catches the copy inside the EFI boot
partition image that UEFI firmware actually reads. (2) Match kernel lines
by GRUB 'linux' command prefix instead of requiring '/boot/linux' path.
Added detailed logging of original and modified grub.cfg content.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
josh
82c637ccbb