Exetasis 'AI and Sovereignty' abstract: unverified citations and leftover [CONFIRM] #861

From the review of #851 (now merged). Facts only, wording is the author's call:

1. The abstract cites Centola & Macy (2007) and Santos et al. (2021), but literature/VERIFICATION.md marks both "Pending, not read". Records as supplied: Centola & Macy, AJS 113(3) 702–734, doi:10.1086/521848; Santos et al., PNAS 118(50) e2102141118. Read and mark verified before submission.
2. The abstract cites Coeckelbergh 2023; the verification key is coeckelbergh2022 (online 2022, issue 2023). Pick one year and use it in both places.
3. ABSTRACT.md:57-58 (bio) still carries [CONFIRM].
4. model/cs_sim.py panel (b): min(B, len(bn)) caps the bridge budget at 16, so rows B=24–64 compare unequal budgets (understates the bridge effect; label or fix).
5. The PR body describes the opening commit rather than v5.2.