Function public_commit_outcome_reply 

pub fn public_commit_outcome_reply(
    outcome: Result<Option<Option<String>>, SessionError>,
) -> Option<SessionReply>

Render a durable public-transaction commit lookup. None means the lookup has no terminal record, so a caller that can still reach a live connection-affine session should continue routing the commit there. A found outcome or lookup failure is already terminal and can be answered without occupying a writer connection.