RAMPART-459: also record Error failures from OpenSAML init

Classpath faults such as NoClassDefFoundError or ServiceConfigurationError
escaped the cache, so they were retried per message and failed non-SAML
traffic too. They are now wrapped and recorded; VirtualMachineError still
propagates uncached.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>