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Switch Raspberry Pi builds from proprietary firmware direct-boot to a firmware → U-Boot → GRUB → kernel chain using GPT partitioning: - GPT partition layout with fixed UUIDs matching os_install: firmware (128MB), ESP (100MB), boot (2GB FAT32), root (btrfs) - U-Boot as the kernel in config.txt, chainloading GRUB EFI - Pi-specific GRUB config overrides (console, USB quirks, cgroup) - Btrfs root with shrink-to-minimum for image compression - init_resize.sh updated for GPT (sgdisk -e) and btrfs resize - Removed os-partitions from config.yaml (now derived from fstab)