Say on the changelog that conversations get names

Author: zopeVaibhav

CHANGELOG.md

@@ -8,6 +8,15 @@ Newest first. `Unreleased` is what is on `main` and not yet tagged.
 
 ## Unreleased
 
+### A conversation is given a name of its own
+
+A channel was labelled with the names of the Bots in it, so every conversation with the same
+coworker read the same on the roster, and the only thing telling two of them apart was a preview of
+whatever was said last. That preview is usually the tail of an answer, which says nothing about the
+question that prompted it. Once a conversation has an opening exchange, the deployment's own model
+is asked for a few words naming what it is about, and the roster draws those words in place of the
+preview. A deployment with no model key configured names nothing and looks exactly as it did before.
+
 ### A hop the boundary refused now names the Bot that was refused
 
 The audit page renders its Bot column from `payload.bot` and nothing else. `agent.handoff_offered`