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Add an RFC document describing the composable image architecture that replaces monolithic guest rootfs images with a lean base image plus purpose-specific addon images cold-plugged as virtio-blk devices. The proposal covers the runtime configuration (extra_images), host-side cold-plugging, guest-side mounting via systemd and dm-verity, agent-side dynamic path resolution, the image build pipeline, and the security model. Signed-off-by: Fabiano Fidêncio <ffidencio@nvidia.com> Co-authored-by: Cursor <cursoragent@cursor.com>