Function write_artifact 

pub fn write_artifact(
    output: &Path,
    metadata: PackArtifactMetadata,
    contents: Vec<PackArtifactContent>,
) -> Result<String>

Writes a deterministic pack artifact and returns its hexadecimal SHA-256 digest.

Errors

Returns an error for unsafe or duplicate artifact paths, oversized metadata, an existing output path, serialization failure, or filesystem failure.