Function history_events 

pub fn history_events(buffer: &EventBuffer) -> Vec<Value>

Buffered frames that may be replayed, oldest first.

Pairing credentials are broadcast-only and delivery-once: they are never replayed, so a client that connects after pairing cannot recover the QR payload or pair code. Login events bypass the observer that fills the buffer, so a marked frame should never be here in the first place; this filter fails closed as defense in depth.