chore: show the enriched events in the changeset example

Author: ericallam

.changeset/chat-transport-onevent.md

@@ -2,7 +2,7 @@
 "@trigger.dev/sdk": patch
 ---
 
-Add an `onEvent` observability callback to `TriggerChatTransport` / `useTriggerChatTransport` that emits typed lifecycle events: `message-sent` and `message-send-failed` (durable send outcomes with source and duration), `stream-connected`, `first-chunk`, `turn-completed`, and `stream-error`. Together these make send-success metrics, time-to-first-token, and "sent but never answered" watchdogs a few lines of client code.
+Add an `onEvent` observability callback to `TriggerChatTransport` / `useTriggerChatTransport` that emits typed lifecycle events: `message-sent` and `message-send-failed` (durable send outcomes with source, duration, payload size, and the append's idempotency key), `stream-connected`, `first-chunk` and `turn-completed` (with built-in time-to-first-token and turn latency via `sinceSendMs`), and `stream-error`. Send-success metrics, TTFT, and "sent but never answered" watchdogs become a few lines of client code.
 
 ```ts
 const transport = useTriggerChatTransport({
@@ -12,6 +12,12 @@ const transport = useTriggerChatTransport({
     if (event.type === "message-sent") {
       metrics.timing("chat.send_duration_ms", event.durationMs);
     }
+    if (event.type === "first-chunk") {
+      metrics.timing("chat.ttft_ms", event.sinceSendMs ?? 0);
+    }
+    if (event.type === "message-send-failed") {
+      metrics.increment("chat.send_failed", { status: event.status });
+    }
   },
 });
 ```