Add Chapters 11–15: complete the Practitioner Track

[luigipascal]

Summary

Ships the final five Practitioner Track chapters at full Ch 1–10 parity, completing the track (15/15 chapters now available, 124 hours of content).

#	Title	Hours
11	Large Language Models & Transformers	10
12	Prompt Engineering & In-Context Learning	6
13	Retrieval-Augmented Generation (RAG)	8
14	Fine-tuning & Adaptation Techniques	8
15	MLOps & Model Deployment	8

Each chapter follows the established Berta Chapters layout:

• README.md (8 learning objectives, time table, tech stack, Quick Start, troubleshooting, next-steps)
• notebooks/ — 3 notebooks (intro / intermediate / advanced)
• scripts/ — config.py + 3 utility/main scripts with real implementations
• exercises/ — 2 problem-set notebooks + full solution notebooks + a CI-friendly solutions.py
• assets/diagrams/ — 3 Mermaid diagrams
• datasets/ — sample data + dataset README
• requirements.txt — pinned, sectioned

All notebook code runs offline with no external API calls. Optional heavy deps (transformers, peft, faiss, fastapi, mlflow, evidently) are wrapped in try/except with install hints and numpy/sklearn fallbacks.

Site integration

• Top-level README.md, ROADMAP.md, SYLLABUS.md updated to reflect Practitioner Track complete (Phase 2 done)
• mkdocs.yml nav adds 25 new entries (5 chapter pages + 15 content pages)
• 5 new docs/chapters/chapter-NN.md overview pages
• 15 new docs/chapters/content/chNN-XX_*.md summary pages
• docs/index.md regenerated via scripts/generate_homepage_data.py: 15 chapters, 45 notebooks, 57 exercises, 46 diagrams, 124h

Validated locally

Same logic as .github/workflows/validate-chapters.yml:

• ✅ All 15 chapters pass structure checks (README, requirements, notebooks/, scripts/, exercises/)
• ✅ All 35 new notebooks parse as valid JSON
• ✅ All 5 new exercises/solutions/solutions.py scripts exit 0
• ✅ All mkdocs.yml nav targets resolve to existing files

Test plan

• CI validate-chapters passes across Python 3.10/3.11/3.12
• CI deploy-site builds with mkdocs build --strict
• Spot-check rendered chapter pages in the deployed site
• Spot-check at least one notebook from each new chapter runs end-to-end with pip install -r requirements.txt
• Confirm Practitioner Track tile on homepage shows the new chapters

https://claude.ai/code/session_019bdy2AsZg3rFmcMgRyPQS1

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Generated by Claude Code