Finish long-running agent parity

README.md

@@ -39,6 +39,12 @@ persisted as transcript roles and automatically continue the same model turn.
 File tools stay inside the selected project. Web tools ask before starting a
 visible Chrome profile.
 
+Long sessions compact automatically while retaining the complete scrollable
+chat. Each compaction appears in history with its durable summary, and a missing
+or incompatible KV checkpoint rebuilds from the latest summary and subsequent
+chat. An idle session's `…` menu can force compaction after new chat has been
+added since the latest marker, or discard its checkpoint for a clean rebuild.
+
 The app also listens on `127.0.0.1:4000` by default for Models, Chat
 Completions, Completions, Anthropic Messages, and Responses APIs. The listener,
 port, and opt-in CORS are configurable in Preferences. The