feat: add search term to thread list (#12578)

Add `searchTerm` to `thread/list` that will search for a match in the
titles (the condition being `searchTerm` $$\in$$ `title`)

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

@@ -1920,6 +1920,13 @@
             "null"
           ]
         },
+        "searchTerm": {
+          "description": "Optional substring filter for the extracted thread title.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "sortKey": {
           "anyOf": [
             {

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

@@ -12896,6 +12896,13 @@
               "null"
             ]
           },
+          "searchTerm": {
+            "description": "Optional substring filter for the extracted thread title.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
           "sortKey": {
             "anyOf": [
               {

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

@@ -65,6 +65,13 @@
         "null"
       ]
     },
+    "searchTerm": {
+      "description": "Optional substring filter for the extracted thread title.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
     "sortKey": {
       "anyOf": [
         {

codex-rs/app-server-protocol/schema/typescript/v2/ThreadListParams.ts

@@ -36,4 +36,8 @@ archived?: boolean | null,
  * Optional cwd filter; when set, only threads whose session cwd exactly
  * matches this path are returned.
  */
-cwd?: string | null, };
+cwd?: string | null, 
+/**
+ * Optional substring filter for the extracted thread title.
+ */
+searchTerm?: string | null, };