feat: annotate experimental fields in app server protocol

codex-rs/app-server-json-schema/stable/v2/ThreadReadParams.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "properties": {
+    "includeTurns": {
+      "default": false,
+      "description": "When true, include turns and their items from rollout history.",
+      "type": "boolean"
+    },
+    "threadId": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "threadId"
+  ],
+  "title": "ThreadReadParams",
+  "type": "object"
+}