n8n adds workflow review and per-agent MCP limits

n8n 2.34.0 adds a workflow review system, letting a teammate approve or request changes on a workflow before it auto-publishes, along with per-agent MCP access management so admins can scope exactly which tools and permissions each connected agent gets. The release also adds OIDC logout support, configurable SSO role mapping, and a simplified custom-auth credential type for HTTP requests.