Package identity hashed files in a segment-wise depth-first walk order, so a
file like references/refs.md sorted after references/refs/image.webp. The
manifest validators require complete paths in code-unit order, so such
skills failed with skill-bundle-manifest-path-order. Sort the complete
paths by code unit in both the runtime identity and the build-time manifest
generator, and cover the sibling file/directory layout with a round trip.
Co-authored-by: yukurust <76849725+yshi112358@users.noreply.github.com>
Co-authored-by: Neil <neil@stably.ai>
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