fix(server): watching a pull request again no longer repeats news the thread already got (#21155)

Co-authored-by: PR Batch Tester <agent@local.test>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
24c71ebdd7shivam committed on 10/18/2026, 7:51:53 PM· committed by GitHubparent8678a80
6 files changedLine totals unavailable