Add an agent extension runner - #33076
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## What changed - Add `codex-agent-extension` with an `AgentRunner` that starts a resolved agent prompt in a thread forked from its parent. - Propagate the invocation's trace context, select the configured execution environments, submit the initial prompt, and return the spawned thread and turn identifiers. - Reject empty agent prompts and report when the owning thread manager is no longer available. ## Testing - Add an integration test that verifies the agent runs in a forked thread, returns the started turn identifier, completes the turn, and sends the resolved prompt to the model. GitOrigin-RevId: ffb805efabadf758969d6611a6867db6fa9f059a
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Add an agent extension runner
What changed
codex-agent-extensionwith anAgentRunnerthat starts a resolved agent prompt in a thread forked from its parent.Testing