jif 6629e08702 Add an agent extension runner (#33076) ...

## 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

2026-07-14 14:41:30 +00:00

..

agent_service.rs

Add an agent extension runner (#33076)

2026-07-14 14:41:30 +00:00