`dais-sidecar` reads and writes presentation metadata stored next to a PDF.
It defines Dais metadata types, a sidecar format trait, the native `.dais`
format, and `.pdfpc` compatibility for notes and overlay grouping.
```rust
use dais_sidecar::format::SidecarFormat;
use dais_sidecar::pdfpc::PdfpcFormat;
let metadata = PdfpcFormat.read(std::path::Path::new("slides.pdfpc"))?;
```