Module structure 

Document-structure read APIs: outlines, annotations, attachments.

These close the three items the prior core-PDF closure left as out-of-scope, per PHASE1_PRODUCT_SCOPE_DECISIONS.md:

• Outlines / bookmarks: read + write (PdfDocument::outlines / set_outlines), backed by pdf_manip::bookmarks.
• Annotations: read/list (PdfDocument::annotations). Write/CRUD on the Rust facade is intentionally not exposed for v1 — the v1 annotation-authoring surface is the WASM binding / pdf-annot builder.
• Attachments / embedded files: read/list + extract (PdfDocument::attachments / attachment_bytes). Write (adding embedded files) is intentionally not exposed for v1.

All reads operate on the in-memory lopdf::Document already held by PdfDocument; no new crate dependency is introduced.

Structs

AnnotationInfo

Read-only view of a single page annotation.

Attachment

Read-only view of an embedded-file attachment.

Outline

A document outline (bookmark) entry.