## What changed

<!-- Briefly: which week/module/guide, and why. -->

## Type

- [ ] New week content / notebook
- [ ] Knowledge-base or guide update
- [ ] Curriculum structure change (`curriculum/manifest.json`)
- [ ] Tracker regeneration
- [ ] Fix (typo, broken code, stale fact)

## Checklist

- [ ] Notebooks run end-to-end, or are clearly marked ⚠️ REQUIRES (API key / GPU)
- [ ] Sources section lists every vendor doc consulted
- [ ] No secrets, no third-party course content
- [ ] `manifest.json` updated and `scripts/build_tracker.py` regenerated (if structure changed)

## Reviewer note

<!-- One line: what a reviewer should focus on. -->