ref(chat): add native Turn execution - #1679
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Internal child work now uses the native
executeTurnfunction. The child worker saves its result before the runtime marks the Turn complete or failed. Completed execution returns onlycompleted, so later code cannot act on a model result that lost a race to an earlier saved result.The runtime now owns Turn event storage directly. It does not accept an options or services object. The only passed service is
AgentRunner, the model boundary used by production setup and model fakes. The child worker also takes that runner directly instead of a one-field options object.An agent Run error follows the existing child retry rules. An error while saving the result goes back to the queue, so saved work can still be recovered.
This is a small part of #1563. It does not change routing, IDs, recovery rules, Slack, the Conversation API, or the local CLI. We can move those callers in separate changes after this boundary is proven.
The existing child-work integration scenario checks successful and failed Turn events through real Junior wiring. A focused component scenario protects the Run-error and save-error boundary.