Replaces the Fedora DVD/netinst base with a live-ISO boot chain
(root=live:CDLABEL=Fedora-Cinn-Live-44 rd.live.image instead of
inst.stage2=/inst.ks=), implementing ADR-0003. The GRUB menu now
offers two entries booting the same live image with a
tuxflotte.mode=auto/interactive kernel cmdline flag instead of a
boot-time kickstart URL - installer.sh will read this flag once it
runs inside the live session.
scripts/build.sh and scripts/extract.sh now extract the source ISO via
`xorriso -osirrox` instead of a loop mount, removing the sudo
dependency for local builds.
Verified end-to-end in QEMU/KVM: GRUB menu renders both entries,
kernel/initrd load correctly, boot proceeds to the live session.
