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rhan-oai
37f199dab1
## What changed - Add `CodexThread::create_child` to create an idle child from a live tool invocation using a host-reserved thread ID and controller. - Add `prepare_child` and `ThreadManager::create_prepared_child` to capture inherited settings and fresh or forked history, then start the child on another manager even after the parent shuts down. Reject detached preparation when live bindings cannot be transferred. - Add opt-in `HostToolInvocationLookup` to track live calls and reject duplicate active call IDs within a turn. Revoke invocation access when dispatch ends and clean up provisional children when startup fails or is cancelled. ## Testing Add tests for invocation lifetime and call ID reservation, inherited policy and live bindings, detached startup with fresh and full history, and cancellation cleanup. GitOrigin-RevId: 71f17ecb4cd7636517e675df59289a8e8c7105b8