Per RFC-WS-6 §Q1 v1.3 addition 4.
Configurable deadline for FormBindingApplicator::apply(). Default 5
seconds catches the long tail of slow applies before they hang the
public flow. Tunable per environment via FORM_BUILDER_APPLY_DEADLINE_SECONDS.
Consumed by ApplyBindingsOnFormSubmit::handle's withDeadline() call
(landed in Phase B).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>