Per RFC-WS-6 §Q1 v1.3 addition 2.
Broadcast event class only — not yet dispatched. D2 wires the dispatch
call into TriggerPersonIdentityMatchOnFormSubmit::handle (after the
final identity_match_status write), and the channel-authorization
callback into routes/channels.php.
Frontend Echo subscription is a separate frontend follow-up (out of
WS-6 v1.3-delta scope).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
