Old bootable/recovery + vendor/pawlet/twrp_recovery + vendor/twrp
projects were commented-out remnants of the abandoned full-fork
approach. Current design keeps stock bootable/recovery unforked and
plugs TWRP's GUI/toolkit in via vendor/pawlet/recovery_ui and
recovery_toolkit, already synced as part of vendor/pawlet. Adds
external/update_binary (applypatch/updater/edify, restored after
Google dropped it from AOSP) which had no manifest entry at all.