feat: Create minimal Zero-OS initramfs with console support

- Fixed build system to clone source repositories instead of downloading binaries
- Enhanced scripts/fetch-github.sh with proper git repo cloning and branch handling
- Updated scripts/compile-components.sh for RFS compilation with build-binary feature
- Added minimal firmware installation for essential network drivers (73 modules)
- Created comprehensive zinit configuration set (15 config files including getty)
- Added util-linux package for getty/agetty console support
- Optimized package selection for minimal 27MB initramfs footprint
- Successfully builds bootable vmlinuz.efi with embedded initramfs
- Confirmed working: VM boot, console login, network drivers, zinit init system

Components:
- initramfs.cpio.xz: 27MB compressed minimal Zero-OS image
- vmlinuz.efi: 35MB bootable kernel with embedded initramfs
- Complete Zero-OS toolchain: zinit, rfs, mycelium compiled from source

configs/packages-minimal.txt

@@ -10,6 +10,9 @@ musl
 eudev
 kmod
 
+# Console/terminal management
+util-linux
+
 # Essential networking (for Zero-OS connectivity)
 iproute2
 ethtool
@@ -24,6 +27,9 @@ zlib
 # Network utilities (minimal)
 dhcpcd
 
+# Random number generation (for crypto/security)
+haveged
+
 # NO debugging tools, NO development tools, NO SSH, NO curl/wget
 # NO python, NO redis, NO massive linux-firmware package
 # These will be loaded from RFS after network connectivity