Fix BOOT_PATH logic in grub-install: non-removable installs now use
EFI/${BOOTLOADER_ID} per UEFI spec instead of always EFI/BOOT.
Add timeout validation to grub-mkconfig (must be non-negative integer).
Add sync() method to fat_tool.py and call os.fsync after cp_in to
ensure data reaches disk. Fix misleading block-device error message.
- Add grub package to redbear-full-grub.toml so make all works from
a clean tree (the installer needs grub.efi before it runs)
- Fix stat -f%z (macOS-only) to stat -c%s (Linux) in GRUB recipe
- Normalize bootloader config value to lowercase in install_inner so
bootloader = "GRUB" from config files is accepted
- Add bad-cluster marker (0x0FFFFFF7) check in fat_tool.py
_next_cluster to prevent potential infinite loops on degraded media
- Fix file handle leak in fat_tool.py if _read_bpb raises
- Clean up temp directory in fetch_bootloaders on error
- Update AGENTS.md with GRUB recipe and installer documentation
- Update GRUB plan with clean-build prerequisite note
fat_tool.py provides zero-dependency FAT32 manipulation (ls, mkdir,
cp-in, cp-out) using only Python stdlib struct/os. install-grub.sh uses
it to extract the existing Redox bootloader from ESP, install GRUB as
the primary boot manager, and set up the chainload configuration.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
vasilito