Per RFC Q2: the 'no subject → pending' path becomes unreachable for event_registration submissions because ApplyBindingsOnFormSubmit provisions the Person before this listener fires. Path preserved as failsafe with explicit warning log so misconfigurations and silent ApplyBindings failures surface mechanically. Existing test updated to spy on Log facade and assert the warning fires. Refs: RFC-WS-6.md §3 (Q2) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>