fix(server): Stop stops a thread's subagents again (#23886)

Co-authored-by: PR Batch Tester <agent@local.test>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
fbc6a08159shivam committed on 10/23/2026, 11:45:43 AM· committed by GitHubparentcccb78c

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