[codex-rs] harden review-loop validation flow [ci changed_files]

Co-authored-by: Codex <noreply@openai.com>

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json

@@ -5839,6 +5839,9 @@
                 "string",
                 "null"
               ]
+            },
+            "validate_findings": {
+              "type": "boolean"
             }
           },
           "required": [
@@ -5851,6 +5854,12 @@
         {
           "description": "Exited review mode with an optional final result to apply.",
           "properties": {
+            "failure_message": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
             "review_output": {
               "anyOf": [
                 {