fix(server): restarts no longer stall on old subagent result deliveries (#19631)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
22af947e0dTheo Browne committed on 10/14/2026, 10:53:07 PM· committed by GitHubparentf87dd14
2 files changedLine totals unavailable