fix(workbench): keep running agent timing visible (#1980)

Co-authored-by: root <root@lyon.remote>

internal/cloud/code-agent-agentrun-adapter.ts

@@ -233,8 +233,7 @@ export function initialAgentRunChatResult({ params = {}, options = {}, traceId }
     sessionId: safeSessionId(params.sessionId) || agentRunSessionId(traceId),
     threadId: safeOpaqueId(params.threadId) || null,
     messageId: `msg_${safeTraceId(traceId)?.slice(4) || randomUUID()}`,
-    createdAt: timestamp,
-    updatedAt: timestamp,
+    ...agentRunAdmissionTimingFields(timestamp),
     provider: providerForBackendProfile(backendProfile),
     model: modelForBackendProfile(backendProfile, env),
     backend: backendForBackendProfile(backendProfile),
@@ -258,6 +257,28 @@ export function initialAgentRunChatResult({ params = {}, options = {}, traceId }
   };
 }
 
+function agentRunAdmissionTimingFields(value) {
+  const admittedAt = timestampIsoOrNow(value);
+  const timing = {
+    startedAt: admittedAt,
+    lastEventAt: admittedAt,
+    finishedAt: null,
+    durationMs: null,
+    observedAt: admittedAt,
+    lastEventAgeMs: 0,
+    valuesRedacted: true
+  };
+  return {
+    createdAt: admittedAt,
+    updatedAt: admittedAt,
+    timing,
+    startedAt: admittedAt,
+    lastEventAt: admittedAt,
+    finishedAt: null,
+    durationMs: null
+  };
+}
+
 export async function submitAgentRunChatTurn({ params = {}, options = {}, traceId, traceStore = defaultCodeAgentTraceStore, results }) {
   const env = options.env ?? process.env;
   const managerUrl = resolveAgentRunManagerUrl(env);
@@ -3222,6 +3243,11 @@ function nowIso(now) {
   return typeof now === "function" ? now() : new Date().toISOString();
 }
 
+function timestampIsoOrNow(value = null) {
+  const parsed = Date.parse(String(value ?? ""));
+  return Number.isFinite(parsed) ? new Date(parsed).toISOString() : new Date().toISOString();
+}
+
 function redactUrl(value) {
   try {
     const url = new URL(value);