Bib proactive verification: Xiong 2nd author fix + expand 3 'et al.' entries

While user runs Semantic Scholar verification, I WebSearch-verified the 4
citations I flagged as 'never independently checked' and found one real bug
plus opportunity to expand others:

- Xiong 2020: second author was 'Yunchang Yu' in my bibitem, but the actual
  author is 'Yunchang YANG'. Fixed. Also expanded to the full 10-author list.
- Paleka 2026: expanded 'Daniel Paleka et al.' -> 'Daniel Paleka, Shashwat
  Goel, Jonas Geiping, and Florian Tramèr'. Title/venue confirmed correct.
- O'Bray 2022: expanded 'Leslie O'Bray et al.' -> 'Leslie O'Bray, Max Horn,
  Bastian Rieck, and Karsten M. Borgwardt'. Title/venue confirmed correct.
- Jordan 2020: expanded 'Scott M. Jordan et al.' -> 'Scott Jordan, Yash
  Chandak, Daniel Cohen, Mengxue Zhang, and Philip Thomas'. Also dropped
  incorrect middle initial 'M.' Title/venue confirmed correct.

All 4 citations now have full verified author lists. The Yang/Yu typo was
a real factual error that Semantic Scholar would have caught.

Main content still 9 pages. Task list unchanged.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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