Product SSOT

docs/product-ssot/ is the canonical product requirements and policy ledger for the monorepo.

It is separate from llm-wiki/:

• Product SSOT contains the canonical requirement/policy/decision text.
• LLM Wiki contains navigation, summaries, backlinks, and pointers to canonical docs.

Initial priority domains:

1. auth
2. class
3. course
4. payment
5. notification

Each domain should grow only when it has real source material. Avoid empty large taxonomies.