Map how several papers relate to each other

Map the relationships between these papers.

Produce:
1. Lineage — which papers build on which, and what each added.
2. Disputes — where papers disagree. State both positions and what the disagreement turns on (method, data, definition).
3. Shared assumptions no paper in the set questions. *These are where a contribution is often available.*
4. Single-source claims — asserted by one paper and repeated by others without independent support.
5. Gaps relative to my topic, ranked by how addressable they are.

Rules:
- Work only from the summaries I gave you. *Do not add papers from your own knowledge*, even famous ones — I cannot verify what I have not read.
- Where a summary is too thin to place a paper, say so rather than inferring its position.
- Distinguish "disagrees" from "studies something different". They are constantly confused.