fix(server): update Claude Agent SDK to 0.3.260 (#9135)

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
560afffdeaTheo Browne committed on 9/4/2026, 1:23:12 PM· committed by GitHubparentcaa8a0d
5 files changedLine totals unavailable