basic undo feature (#1268)

Co-authored-by: adamdotdevin <2363879+adamdottv@users.noreply.github.com>
Co-authored-by: Jay V <air@live.ca>
Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Co-authored-by: Andrew Joslin <andrew@ajoslin.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Tobias Walle <9933601+tobias-walle@users.noreply.github.com>

stainless.yml

@@ -120,6 +120,8 @@ resources:
       summarize: post /session/{id}/summarize
       messages: get /session/{id}/message
       chat: post /session/{id}/message
+      revert: post /session/{id}/revert
+      unrevert: post /session/{id}/unrevert
 
   tui:
     methods: