Merge remote-tracking branch 'origin/main' into codex/prefix-compaction-prewarm

codex-rs/app-server-protocol/schema/json/v2/ThreadListResponse.json

@@ -1970,6 +1970,13 @@
     }
   },
   "properties": {
+    "backwardsCursor": {
+      "description": "Opaque cursor to pass as `cursor` when reversing `sortDirection`. This is only populated when the page contains at least one thread. Use it with the opposite `sortDirection`; for timestamp sorts it anchors at the start of the page timestamp so same-second updates are not skipped.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
     "data": {
       "items": {
         "$ref": "#/definitions/Thread"