:sig
DTree zip_list(String zip_file_name)

:params
zip_file_name : path to the ZIP archive to inspect
return value : DTree containing archive metadata and an `entries` array

:see
>sys
zip_create
zip_read
zip_extract
DTree

:content
Reads the central directory from `zip_file_name` and returns structured metadata.

The returned tree contains:

- `file` : archive path
- `count` : number of entries
- `entries` : list of entry metadata

Each entry contains:

- `name`
- `index`
- `size`
- `compressed_size`
- `is_directory`
- `method`

Example:

```uce
DTree info = zip_list("/tmp/example.zip");
print(json_encode(info));
```