fix(acp): one malformed session update no longer ends the session (#20015)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
559c4b1f21Julius Marminge committed on 10/15/2026, 9:21:59 PM· committed by GitHubparentede3f2d
8 files changedLine totals unavailable