Surface Codex JSONL error events in step-summary rendering

Codex CLI's JSONL log format emits item.completed events with
item.type "error" (e.g. model-fallback warnings), but
parseCodexJsonl() silently dropped any item type it didn't
recognize, so these messages never reached the rendered step
summary or logEntries.

Found while verifying the rendering pipeline against real output
from workflow run 33729471900 (Issue Monster, codex engine): the
log contained a "Model metadata ... not found" error item that
was completely absent from the generated markdown.

Author: github-actions[bot]

actions/setup/js/parse_codex_log.cjs

@@ -409,14 +409,31 @@ function parseCodexJsonl(logContent) {
         });
         break;
       }
+      case "error": {
+        const message = typeof item.message === "string" ? item.message : JSON.stringify(item);
+        if (message.trim()) {
+          parsedData.push({ type: "error", content: message });
+        }
+        break;
+      }
       default:
         break;
     }
   }
 
+  const errorMessages = parsedData.filter(item => item.type === "error").map(item => item.content);
+
   // Build markdown so the parser returns a truthy result and core.info has a
   // readable fallback. The step summary itself is rendered from logEntries.
-  let markdown = "<details>\n<summary>Reasoning</summary>\n\n";
+  let markdown = "";
+  if (errorMessages.length > 0) {
+    markdown += "<details>\n<summary>Errors</summary>\n\n";
+    for (const message of errorMessages) {
+      markdown += `> ${message}\n\n`;
+    }
+    markdown += "</details>\n\n";
+  }
+  markdown += "<details>\n<summary>Reasoning</summary>\n\n";
   for (const item of parsedData) {
     if (item.type === "text") {
       markdown += `${item.content}\n\n`;
@@ -456,17 +473,21 @@ function parseCodexJsonl(logContent) {
     model: model || undefined,
   });
 
-  // Surface token usage and turn count via a result entry so Statistics and the
-  // OTEL telemetry enrichment (agent-stdio.log result line) are populated.
-  if (usage) {
+  // Surface token usage, turn count, and error messages via a result entry so
+  // Statistics, the Information section's Errors list, and the OTEL telemetry
+  // enrichment (agent-stdio.log result line) are populated.
+  if (usage || errorMessages.length > 0) {
     logEntries.push({
       type: "result",
       num_turns: turnCount > 0 ? turnCount : undefined,
-      usage: {
-        input_tokens: typeof usage.input_tokens === "number" ? usage.input_tokens : undefined,
-        output_tokens: typeof usage.output_tokens === "number" ? usage.output_tokens : undefined,
-        cache_read_input_tokens: typeof usage.cached_input_tokens === "number" ? usage.cached_input_tokens : undefined,
-      },
+      usage: usage
+        ? {
+            input_tokens: typeof usage.input_tokens === "number" ? usage.input_tokens : undefined,
+            output_tokens: typeof usage.output_tokens === "number" ? usage.output_tokens : undefined,
+            cache_read_input_tokens: typeof usage.cached_input_tokens === "number" ? usage.cached_input_tokens : undefined,
+          }
+        : undefined,
+      errors: errorMessages.length > 0 ? errorMessages : undefined,
     });
   }