Archive metadata

`zip_metadata`

Field	Meaning
`file_size`, `file_count`	Archive size and entry count
`entries`	`{ path, uncompressed_size, compressed_size, detected_type, modified, compression_method }[]`
`total_uncompressed`, `total_compressed`	Summed sizes
`entry_type_counts`	Counts by detected `FileType`
`comment`	ZIP archive comment

OS junk paths (__MACOSX, .DS_Store, Thumbs.db, …) are filtered from listings.

TAR and compressed TAR variants (tar, tar.gz, tgz, tar.bz2, tar.xz):

Field	Meaning
`format`	Archive variant
`file_count`, `entries`	`{ path, size }[]`
`compressed_size`, `uncompressed_size`	On-disk vs summed entry sizes
`truncated`, `note`	Listing limits; compressed TAR may omit full entry list