docs: add three LiveCD/embedded patterns from bee project
- alpine-livecd: mkimage profile rules, apkovl mechanics, workdir caching,
squashfs compression, NIC firmware, long build survival via screen
- vendor-installer-verification: checksum-before-download, cache validation,
version URL verification before writing build scripts
- unattended-boot-services: OpenRC invariants for headless environments,
network-independent SSH, persistent DHCP, graceful degradation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mchus
a38c35ce2d