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## Summary Wires rollout trace recording into `codex-core` session and turn execution. This records the core model request/response, compaction, and session lifecycle boundaries needed for replay without yet tracing every nested runtime/tool boundary. ## Stack This is PR 2/5 in the rollout trace stack. - [#18876](https://github.com/openai/codex/pull/18876): Add rollout trace crate - [#18877](https://github.com/openai/codex/pull/18877): Record core session rollout traces - [#18878](https://github.com/openai/codex/pull/18878): Trace tool and code-mode boundaries - [#18879](https://github.com/openai/codex/pull/18879): Trace sessions and multi-agent edges - [#18880](https://github.com/openai/codex/pull/18880): Add debug trace reduction command ## Review Notes This layer is the first live integration point. The important review question is whether trace recording is isolated from normal session behavior: trace failures should not become user-visible execution failures, and recording should preserve the existing turn/session lifecycle semantics. The PR depends on the reducer/data model from the first stack entry and only introduces the core recorder surface that later PRs use for richer runtime and relationship events.