fix(server): long agent turns no longer load whole when a thread opens (#24589)

Co-authored-by: luke2x <97411838+luke2x@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
553203c57bTheo Browne committed on 10/24/2026, 11:54:50 PM· committed by GitHubparent843f4e3

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