pub fn inbound_envelope_id(text: &str) -> Option<&str>Expand description
The envelope’s own message id out of a peer wrapper header
([Message id=m-1a2b3c from agent ...]). Unique per delivered
envelope, so it keys an inbound-led messaging group independently
of where the message sits in the session - unlike a positional key,
it survives history pruning and index shifts.