Complete module dependency fixes and build improvements

- Implement proper recursive dependency resolution using depmod -av + modinfo -k
- Copy configs/init as /sbin/init instead of creating symlink to zinit
- Fix validation to check /sbin/init as executable file (not symlink)
- Remove automatic cleanup - always preserve build artifacts for incremental builds
- Module resolution now finds missing core modules: virtio.ko, virtio_ring.ko, nvme-core
- Recursive resolution verified: nvme→nvme-core, virtio_scsi→5 dependencies
- Final chroot depmod creates proper module database for boot-time loading

scripts/build.sh

@@ -358,11 +358,6 @@ function main_build_process() {
     fi
 }
 
-# Keep all build artifacts by default for incremental builds and debugging
-function cleanup_build_artifacts() {
-    log_info "Build artifacts preserved for incremental builds"
-    log_info "Use ./scripts/clean.sh to manually clean artifacts when needed"
-}
 
 # Main function
 function main() {
@@ -416,8 +411,6 @@ function main() {
         return 1
     fi
     
-    # Always preserve artifacts for incremental builds
-    cleanup_build_artifacts
     
     section_header "Zero OS Build Complete"
     log_info "Ready to deploy Zero OS with Alpine Linux and zinit"