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## Summary Extends rollout tracing across tool dispatch and code-mode runtime boundaries. This records canonical tool-call lifecycle events and links code-mode execution/wait operations back to the model-visible calls that caused them. ## Stack This is PR 3/5 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 PR is about attribution. Reviewers should focus on whether direct tool calls, code-mode-originated tool calls, waits, outputs, and cancellation boundaries are recorded with enough source information for deterministic reduction without coupling the reducer to live runtime internals. The stack remains valid after this layer: tool and code-mode traces reduce through the existing crate model, while the broader session and multi-agent relationships are added in the next PR.