fix(workbench): project message timing facts from events (#1967)

internal/cloud/workbench-projection-writer.ts

@@ -134,6 +134,28 @@ export async function writeWorkbenchProjectionEvent({ runtimeStore = null, event
   const projectedSeq = nonNegativeInteger(allocation?.projectedSeq);
   if (projectedSeq <= 0) throw new Error("Workbench projection allocator returned an invalid projectedSeq.");
   const eventId = textValue(event.id) || stableFactId("wte", { traceId, sourceEventId });
+  const messageFinalText = finalResponseTextValue(event.finalResponse, event.assistantText, event.reply);
+  const messageFact = sessionId ? normalizeMessageFact({
+    messageId: eventProjectionAssistantMessageId(traceId, event),
+    role: "agent",
+    status,
+    traceId,
+    turnId,
+    text: terminal && messageFinalText ? messageFinalText : "",
+    projectedSeq,
+    sourceSeq,
+    sourceEventId,
+    terminal,
+    sealed: terminal,
+    timing,
+    startedAt: timing.startedAt,
+    lastEventAt: timing.lastEventAt,
+    finishedAt: timing.finishedAt,
+    durationMs: timing.durationMs,
+    createdAt: occurredAt,
+    updatedAt: projectedAt,
+    source: "workbench-event-projection"
+  }, 0, { traceId, sessionId, turnId, terminal, terminalStatus: status, finalText: messageFinalText, timestamp: projectedAt, timing }) : null;
   const facts = {
     sessions: sessionId ? [{
       sessionId,
@@ -172,6 +194,7 @@ export async function writeWorkbenchProjectionEvent({ runtimeStore = null, event
       occurredAt,
       updatedAt: projectedAt
     }],
+    messages: messageFact ? [messageFact] : [],
     checkpoints: [{
       traceId,
       sessionId,
@@ -206,6 +229,16 @@ export async function writeWorkbenchProjectionEvent({ runtimeStore = null, event
   });
 }
 
+function eventProjectionAssistantMessageId(traceId, event = {}) {
+  const explicit = textValue(event.messageId ?? event.assistantMessageId ?? event.assistantMessage?.messageId);
+  if (explicit) return explicit;
+  const traceSuffix = (safeTraceId(traceId) || String(traceId || "trace"))
+    .replace(/^trc_/u, "")
+    .replace(/[^A-Za-z0-9_.:-]/gu, "_")
+    .slice(0, 48) || "trace";
+  return `msg_${traceSuffix}_agent`;
+}
+
 async function writeWorkbenchProjectionFacts({ runtimeStore = null, traceStore = defaultCodeAgentTraceStore, traceId = null, ownerUserId = null, ownerRole = null, sessionId = null, projectId = null, conversationId = null, threadId = null, status = "active", session = {}, payload = null, params = {} } = {}) {
   if (typeof runtimeStore?.writeWorkbenchFacts !== "function") return null;
   const facts = buildWorkbenchProjectionFacts({ traceId, ownerUserId, ownerRole, sessionId, projectId, conversationId, threadId, status, session, payload, params });