• Added support for the end alias in --pages, denoting the last page
  of the document. For example, --pages 3-end OCRs from page 3 through
  the final page. {issue}1615
• Added --ghostscript-jpeg-quality and --ghostscript-jpeg-maxdpi
  advanced options for tuning Ghostscript's PDF/A output. The optimizer's
  --jpeg-quality remains the recommended file-size control.
• Fixed pypdfium2 rasterizer clipping content when the CropBox was smaller
  than the MediaBox (e.g. JSTOR or cropped PDFs). {issue}1685
• Fixed Form XObject cycle detection in the optimizer's image xref scan.
  Self-referential or DAG-shaped Form graphs (notably from PowerPoint
  exports) previously produced floods of recursion warnings and could hang
  for minutes. {issue}1321
• Tesseract config errors are now surfaced as TesseractConfigError with
  actionable guidance, instead of crashing later with a confusing
  FileNotFoundError on the missing hOCR output. {issue}1687
• Refreshed the Chinese README translation. Thanks @cislunarspace.
• Internal refactoring of the _exec and subprocess modules to
  separate probing from execution.
• CI dependency updates.