208cf5f922
Add server-side URL validation for logoutUrl (HTTPS + localhost only), origin validation on the logout endpoint, and a configurable `federated` option (default false) for Auth0 provider logout. Includes comprehensive test coverage for all security controls. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Jack Palmer <jackpalmer@spotify.com>