Add fresh iPXE build (2026) to project

- Built from latest iPXE git source
- Fixes UEFI initrd handoff bugs present in old 2019 version
- Add tftp/ sync to Makefile deploy target
- Track ipxe.efi in git

.gitignore

@@ -5,7 +5,8 @@ images/
 # Boot file artifacts (but keep boot.ipxe configuration)
 http/*
 !http/boot.ipxe
-tftp/
+tftp/*
+!tftp/ipxe.efi
 
 # Generated metadata
 *.img