On a --frida build, fetch_debs.sh resolves the latest frida iphoneos-arm64
release deb (== re.frida.server: no Depends, rootless /var/jb layout) into the
debs cache; the existing first-boot `dpkg -i` step installs it. VPHONE_FRIDA is
forwarded through the host CFW install. No APT source or dependency resolution.
Co-Authored-By: Claude Fable 5 <[email protected]>