Greptile Summary

This PR removes four redundant ?? undefined expressions from src/slack/probe.ts. Since the Slack Web API types result.user_id, result.user, result.team_id, and result.team as string | undefined, nullish-coalescing them to undefined was already a no-op — the change is a pure readability improvement with no behavioral impact.

• Removed ?? undefined from bot.id (result.user_id) and bot.name (result.user)
• Removed ?? undefined from team.id (result.team_id) and team.name (result.team)
• No runtime behavior change; all types remain compatible with the SlackProbe interface

Confidence Score: 5/5

• This PR is safe to merge — it is a no-op refactor with no behavioral change.
• The change only removes ?? undefined expressions where the source values are already string | undefined, making those expressions provably redundant. The target SlackProbe interface types accept string | undefined directly, so the output is identical before and after. There are no logic changes, no new dependencies, and no security surface changes.
• No files require special attention.

_{Last reviewed commit: 1157d93}

Merged via squash.

• Prepared head SHA: ecc73fe47c5ba8be28005e8752cff85eb01ae643
• Merge commit: 5ba1bfdb7b5f0fa86d59b8ad5c1ddf0e63b4af07

Thanks @Cafexss!