test(server): reproduce issue 17812

A deleted thread's worktree is kept when its native subagent thread
survives the delete.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
8b787b7078Julius Marminge committed on 10/22/2026, 11:43:55 PMparent200dad3
1 file changedLine totals unavailable