arXiv frequently returns 503 to default Python urllib clients. Set a
real User-Agent header and retry on 429/5xx with exponential backoff.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- 03-rag, 04-semantic-search: env-var-before-imports fix in build/query scripts
- 03-rag: new libraries section, fetch_arxiv.py, exercises for larger corpus
and finding current SOTA models, formal references (Lewis, Booth)
- 04-semantic-search: libraries pointer back to Part III, larger corpus
subsection, model-update exercise, formal references
- 06-neural-networks: add Nielsen reference (recommended by student)
- README: vocab.md link, agentic systems in description, Ollama prereq for 02-05
- New: vocab.md (glossary organized by section)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
