Google deleted this source from bootable/recovery outright (commit c7ebad5f,
"rm -rf non-AB code", 2024-04-05) — confirmed present at android-14, absent
at android-16.0.0_r4. The runtime side (install.cpp's SetUpNonAbUpdateCommands)
and build-side packaging (ota_from_target_files.py's GenerateNonAbOtaPackage)
both survived; only the source that builds the update-binary executable
itself was removed. Sourced from TeamWin's android_bootable_recovery
(android-14.1), the only living copy found, with install/ZipUtil.cpp,
get_args.cpp, and set_metadata.cpp intentionally left out (only wired into
TeamWin's modified install.cpp, which PawletOS isn't adopting — twrpinstall
carries its own independent copies).
Kept as its own repo, not folded into a recovery fork, so it's buildable
independent of whichever recovery UI ends up in use.