fix: ship Pi images with MontaukOS UEFI boot entry

docs/raspberry-pi.md

@@ -118,6 +118,15 @@ the firmware to load Limine from. The card is padded to
 `RPI4_QEMU_CARD_MIB` (default 4096), and every run starts from a fresh
 copy, so every run is a first boot.
 
+The image's `RPI_EFI.fd` comes with a **MontaukOS** boot entry first in the
+firmware's boot order (`scripts/rpi4-efi-bootorder.py` writes it into the
+release's empty variable store), so the card boots on its own instead of
+falling behind the PXE/HTTP entries the firmware creates. The entry names the
+ESP by the image's MBR disk ID and partition number, so it works from the SD
+slot or a USB drive. A card whose `RPI_EFI.fd` predates it keeps its old
+boot order until it is updated with *Update the UEFI firmware*
+(`--firmware`), which also copies the image's disk ID to the card.
+
 The firmware defaults are what MontaukOS needs; leave them:
 
 - **System Table Mode: ACPI.** The kernel reads ACPI only.