Each v4 delivery is the 14 v3 fields plus reply_to = nil or [event_id, sender, excerpt]:
the quoted author's Matrix id and the first 240 code points of its text, nil excerpt for
a redacted or non-text event, nil reply_to for an unreadable or foreign-room target.
Asked by chat_pending_request.v3, served only with CHAT_PENDING_V4=1; off, that kind is
refused as any unknown kind. v1-v3 bytes unchanged. Golden bytes in persona-chat-v6.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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