fix: capture web-probe code agent trace ids (#572)

Co-authored-by: Codex <codex@noreply.local>

scripts/src/hwlab-node-web-observe-runner-source.ts

@@ -527,13 +527,44 @@ async function sendPrompt(text) {
   if (chatStatus < 200 || chatStatus >= 300) {
     throw new Error("sendPrompt observed POST /v1/agent/chat HTTP " + chatStatus + " " + chatResponse.statusText());
   }
+  let chatPayload = null;
+  let chatPayloadError = null;
+  try {
+    chatPayload = await chatResponse.json();
+  } catch (error) {
+    chatPayloadError = errorSummary(error);
+  }
   let chatUrlPath = "/v1/agent/chat";
   try {
     chatUrlPath = new URL(chatResponse.url()).pathname;
   } catch {
     chatUrlPath = "/v1/agent/chat";
   }
-  return { beforeUrl, afterUrl: currentPageUrl(), textHash: sha256Text(text), textBytes: Buffer.byteLength(text), chatSubmit: { status: chatStatus, statusText: chatResponse.statusText(), urlPath: chatUrlPath }, pageId };
+  const payloadText = chatPayload ? JSON.stringify(chatPayload) : "";
+  const traceId = firstTraceId([payloadText]);
+  const otelTraceId = typeof chatPayload?.otelTrace?.traceId === "string" && /^[0-9a-f]{32}$/u.test(chatPayload.otelTrace.traceId)
+    ? chatPayload.otelTrace.traceId
+    : null;
+  return {
+    beforeUrl,
+    afterUrl: currentPageUrl(),
+    textHash: sha256Text(text),
+    textBytes: Buffer.byteLength(text),
+    chatSubmit: {
+      status: chatStatus,
+      statusText: chatResponse.statusText(),
+      urlPath: chatUrlPath,
+      traceId,
+      otelTraceId,
+      resultUrl: safeUrlPath(chatPayload?.resultUrl),
+      turnUrl: safeUrlPath(chatPayload?.turnUrl),
+      streamUrl: safeUrlPath(chatPayload?.streamUrl),
+      responseParsed: chatPayload !== null,
+      responseParseError: chatPayloadError,
+      valuesRedacted: true
+    },
+    pageId
+  };
 }
 
 async function waitForPromptSideEffect(beforeEvidence, timeoutMs) {