smolvm v1.4.5

What's Changed

• fix(registry): never evict or size-count in-flight .partial downloads by @BinSquare in #558
• Add a node serve route to export a stopped machine to a .smolmachine by @BinSquare in #556
• release: smolvm 1.4.5 by @BinSquare in #559

Full Changelog: v1.4.4...v1.4.5