Tolerate selector_not_found during destructive worktree removal, retry transient
window reopens with bounded attempts, collapse dead split leaves in parked tabs,
stabilize tab-close persistence and diff-scroll assertions, and forward app logs
for visibility into failures. Each fix addresses a root cause—not a test workaround
—and includes a verification pass confirming no regressions. Fixes identified in
shard-10 CI failure (oracle #29710852934).