Notion's bot.workspace_icon is only returned by the OAuth token-grant response, not by /v1/users/me

The Notion OAuth token-grant response (returned during code exchange at https://api.notion.com/v1/oauth/token) includes workspace_id, workspace_name, AND workspace_icon. The runtime GET /v1/users/me endpoint returns only bot.workspace_id and bot.workspace_name, workspace_icon is not present. Consumers that want the icon must capture it during OAuth exchange and persist it; refreshing identity from /users/me later cannot recover it.

When integrating Notion OAuth, persist workspace_icon from the token-grant response at OAuth-exchange time; do not assume it will be available from runtime identity refreshes against /v1/users/me.