Routes the post-ping `_ping-test` cleanup through `spawnQuiet` +
`setupLog.step` so a non-zero exit from `delete-cli-agent.ts` lands
in `logs/setup-steps/cleanup-cli-agent.log` and the progression log,
and prints a one-line warn to the user. Previously the spawnSync was
fire-and-forget with `stdio: 'ignore'`, leaving an orphan agent group
silently if cleanup failed.
Restores the original copy on the cli-agent step labels, the ping
explainer paragraph, and the post-ping spinner stop line — those
copy changes are out of scope for this PR.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
3d6a9b74f3