added a backwards_cursor to let you sync forwards and backwards

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -13582,6 +13582,13 @@
       "ThreadListResponse": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "properties": {
+          "backwardsCursor": {
+            "description": "Opaque cursor to pass as `cursor` when reversing `sortDirection`. if None, the page was empty.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
           "data": {
             "items": {
               "$ref": "#/definitions/v2/Thread"