Preserve failed tool call status in history fallback

Author: benbrandt

src/ResponseItemHistoryFallback.ts

@@ -337,7 +337,7 @@ function createFunctionCallOutputUpdate(
         return {
             sessionUpdate: "tool_call_update",
             toolCallId,
-            status: "completed",
+            status,
             rawOutput: { output: item["output"] },
         };
     }

src/__tests__/CodexACPAgent/data/load-session-response-item-history-fallback.json

@@ -118,6 +118,37 @@
     }
   ]
 }
+{
+  "method": "sessionUpdate",
+  "args": [
+    {
+      "sessionId": "session-legacy",
+      "update": {
+        "sessionUpdate": "tool_call",
+        "toolCallId": "call-rg-failed",
+        "status": "in_progress",
+        "kind": "search",
+        "title": "Search for 'Missing' in src"
+      }
+    }
+  ]
+}
+{
+  "method": "sessionUpdate",
+  "args": [
+    {
+      "sessionId": "session-legacy",
+      "update": {
+        "sessionUpdate": "tool_call_update",
+        "toolCallId": "call-rg-failed",
+        "status": "failed",
+        "rawOutput": {
+          "output": "Chunk ID: search456\nWall time: 0.0000 seconds\nProcess exited with code 1\nOutput:\n"
+        }
+      }
+    }
+  ]
+}
 {
   "method": "sessionUpdate",
   "args": [

src/__tests__/CodexACPAgent/load-session.test.ts

@@ -349,6 +349,27 @@ describe("CodexACPAgent - loadSession", () => {
                         output: "Chunk ID: search123\nWall time: 0.0000 seconds\nProcess exited with code 0\nOutput:\nsrc/service.ts:export class Service {}\n",
                     },
                 },
+                {
+                    type: "response_item",
+                    payload: {
+                        type: "function_call",
+                        name: "exec_command",
+                        arguments: JSON.stringify({
+                            cmd: "rg \"Missing\" src",
+                            workdir: "/test/project",
+                            yield_time_ms: 1000,
+                        }),
+                        call_id: "call-rg-failed",
+                    },
+                },
+                {
+                    type: "response_item",
+                    payload: {
+                        type: "function_call_output",
+                        call_id: "call-rg-failed",
+                        output: "Chunk ID: search456\nWall time: 0.0000 seconds\nProcess exited with code 1\nOutput:\n",
+                    },
+                },
                 {
                     type: "response_item",
                     payload: {