• Improved the --tesseract-pagesegmode help text to point to
  tesseract --help-extra, since Tesseract 5.5.2 moved the page segmentation
  mode documentation there from tesseract --help. Thanks @sokai.
• Internal refactoring: completed a project-wide mypy type-checking pass
  (--check-untyped-defs is now enabled, and the mypy pre-commit hook is now
  blocking rather than advisory), fixing several latent edge-case bugs
  surfaced along the way.
• Release process improvements: migrated from pre-commit to prek for local
  git hooks, and added a dedicated lint job to CI.
• Improved typing strictness for Path.