v2.1.0-rc.6

[2.1.0-rc.6] - 2026-09-18

Fixed

• LoginThrottle::ERROR_CODE (MULTIAUTHTHROTTLED) is now registered with
  a title and description in the \SimpleSAML\Error\ErrorCodes maps, via
  the new \SimpleSAML\Module\multiauthsinglepage\Error\ErrorCodes. Without
  this, any template rendering errorcodes['title'][errorcode] generically
  -- including a theme's own copy of multiauthonepage.twig that predates
  this error code -- crashed with Twig\Error\RuntimeError: Key "MULTIAUTHTHROTTLED" for sequence/mapping ... does not exist, since the
  key was never registered anywhere. SinglepageController now builds
  errorcodes from this class instead of the base one.