Bump mypy to 2.3.1 and refresh all pre-commit hooks (ruff 0.16,
markdownlint 0.18). Fix issues surfaced by the new tooling:
- Use lowercase samesite cookie values (mypy 2.x)
- Remove no-op global declarations and address new ruff findings;
ignore rules that would require behavior changes
- Add missing comma in AI system prompt (strings were concatenated)
- Wrap long README lines for MD013
Migrate from Python 3.11 to 3.13 with updated dependencies. Switch from PyPDF2 to pypdf library for better PDF processing. Add new U14 age groups and extract-pdf utility script.
herel