ISO image labels, volume kinds, and extension helpers.
This crate is part of the `use-archive` facade workspace. It exposes ISO image primitive labels only. It does not read ISO images, mount filesystems, inspect sectors, or extract files.
```rust
use use_iso::{IsoFormat, IsoVolumeKind, is_iso_filename};
assert!(is_iso_filename("installer.iso"));
assert_eq!(IsoFormat::Iso9660.as_str(), "iso9660");
assert_eq!(IsoVolumeKind::Bootable.as_str(), "bootable");
```