- question_generator.py: add max_retries=3/retry_delay=5s loop with
exponential backoff on LLM timeout or server errors; encode filenames
with ascii/replace before printing to avoid UnicodeEncodeError on
Windows cp1252 consoles
- runner.py: encode PDF filenames ASCII-safe for progress messages;
catch generation failures per-document and skip (or re-raise) based
on failure_mode, preventing one bad doc from aborting the whole build
Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>
