Learn how to design AI systems

A first-draft, CI-checked primer on designing systems built on large language models, covering trade-offs, components, solved designs and reference numbers, modelled on Donne Martin's System Design Primer. It includes per-topic deep dives, Anki flashcards, runnable labs and practice questions, with unverified figures marked and listed in PLAN.md. The material is licensed CC BY 4.0 for content and MIT for code, and corrections are invited.