Add sorting/backwardsCursor to thread/list and new thread/turns/list api (#17305)

To improve performance of UI loads from the app, add two main
improvements:
1. The `thread/list` api now gets a `sortDirection` request field and a
`backwardsCursor` to the response, which lets you paginate forwards and
backwards from a window. This lets you fetch the first few items to
display immediately while you paginate to fill in history, then can
paginate "backwards" on future loads to catch up with any changes since
the last UI load without a full reload of the entire data set.
2. Added a new `thread/turns/list` api which also has sortDirection and
backwardsCursor for the same behavior as `thread/list`, allowing you the
same small-fetch for immediate display followed by background fill-in
and resync catchup.

codex-rs/app-server-protocol/schema/json/ClientRequest.json

@@ -2645,6 +2645,13 @@
       },
       "type": "object"
     },
+    "SortDirection": {
+      "enum": [
+        "asc",
+        "desc"
+      ],
+      "type": "string"
+    },
     "TextElement": {
       "properties": {
         "byteRange": {
@@ -2857,6 +2864,17 @@
             "null"
           ]
         },
+        "sortDirection": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/SortDirection"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Optional sort direction; defaults to descending (newest first)."
+        },
         "sortKey": {
           "anyOf": [
             {
@@ -3361,6 +3379,44 @@
       ],
       "type": "string"
     },
+    "ThreadTurnsListParams": {
+      "properties": {
+        "cursor": {
+          "description": "Opaque cursor to pass to the next call to continue after the last turn.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "limit": {
+          "description": "Optional turn page size.",
+          "format": "uint32",
+          "minimum": 0.0,
+          "type": [
+            "integer",
+            "null"
+          ]
+        },
+        "sortDirection": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/SortDirection"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Optional turn pagination direction; defaults to descending."
+        },
+        "threadId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "threadId"
+      ],
+      "type": "object"
+    },
     "ThreadUnarchiveParams": {
       "properties": {
         "threadId": {
@@ -4052,6 +4108,30 @@
       "title": "Thread/readRequest",
       "type": "object"
     },
+    {
+      "properties": {
+        "id": {
+          "$ref": "#/definitions/RequestId"
+        },
+        "method": {
+          "enum": [
+            "thread/turns/list"
+          ],
+          "title": "Thread/turns/listRequestMethod",
+          "type": "string"
+        },
+        "params": {
+          "$ref": "#/definitions/ThreadTurnsListParams"
+        }
+      },
+      "required": [
+        "id",
+        "method",
+        "params"
+      ],
+      "title": "Thread/turns/listRequest",
+      "type": "object"
+    },
     {
       "description": "Append raw Responses API items to the thread history without starting a user turn.",
       "properties": {