Wait for streaming to complete before ending traces in async mode

[CLowbrow]

Description

Fixes a bug where onTraceEnd was called immediately after onTraceStart when streaming is enabled, without waiting for the stream loop to complete.

Behavior

Before: When stream: true, onTraceEnd was called immediately after the run() call returned, before spans ended.

After: When stream: true, onTraceEnd is called asynchronously after the stream loop completes and all spans have ended. The run() call still returns immediately (non-blocking).

Closes #570

[changeset-bot]

🦋 Changeset detected

Latest commit: 1ef4da0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@openai/agents-core	Patch
@openai/agents-openai	Patch
@openai/agents-realtime	Patch
@openai/agents	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[seratch]

Thanks for sending this! At a glance, it looks good to me, but I will take a closer look early next week.