v1.1.1

• Simplify the gem description. Metadata only — no code changes.

v1.1.0

• Opt in with tagged: true. Documents are tagged only when created with
  Prawn::Document.new(tagged: true), matching the tagged? query and standard
  "tagged PDF" terminology. The marked: option is removed (no alias).
• Reduced the patching surface: no pdf-core patches. MarkedContent and
  StructureTree now live under Prawn::Accessibility and use only the public
  renderer API; the structure tree is owned by the document and finalized via
  the existing before_render hook. The high-level API is mixed into
  Prawn::Document with include.
• Untagged output is unchanged (byte-for-byte stock Prawn). Header cells are
  flagged at construction, so Cell#header? is consistent before and after draw.
• Removed the low-level @api private symbols renderer.marked?,
  renderer.structure_tree, PDF::Core::MarkedContent,
  PDF::Core::StructureTree, and PDF::Core::ObjectStore#marked?.

v1.0.0

Initial release.

• Tagged-PDF (Section 508 / WCAG) support layered onto published prawn
  (~> 2.5) and pdf-core (~> 0.10) via prepend and additive re-opens —
  no forking.
• High-level document API on Prawn::Document: tagged?, structure,
  structure_container, artifact, heading, paragraph, figure, plus the
  marked: and language: document options.
• Structure attributes: :Alt, :ActualText, :Lang, :Scope.
• Low-level PDF::Core::MarkedContent (BMC/BDC/EMC) and
  PDF::Core::StructureTree (StructTreeRoot, structure elements, ParentTree,
  MCID allocation).
• Optional prawn-table (~> 0.2) tagging: <Table>/<TR>/<TH>/<TD>
  with header detection and /Scope. Activated automatically when
  prawn-table is present; not a required dependency.

Repackaged from the stalled upstream PRs prawnpdf/pdf-core#67,
prawnpdf/prawn#1391, and prawnpdf/prawn-table#164.