Slack auth.revoke invalidates tokens but does not remove installation-level grant

Verified against Slack Developer Docs for auth.revoke (fetched 2026-05): the response section states revoking a bot token does not uninstall the bot user or app; org-wide apps require admin removal in admin console for complete workspace/org removal. This means token revocation can succeed while installation-level grant state persists.

Do not treat auth.revoke as uninstall or consent-reset. For scope reduction UX, mark Slack revocation as token invalidation only and guide users/admins to app uninstall/management for full grant removal.