fix(server): idle orphaned follow-ups can be cancelled without a running parent (#22581)

Co-authored-by: syberia <n.kuhtin@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
849b3f8948Theo Browne committed on 10/21/2026, 1:26:56 AM· committed by GitHubparent569bd02
7 files changedLine totals unavailable