Owen Lin
27724f6ead
This is PR 3 of the app-server tracing rollout. PRs https://github.com/openai/codex/pull/13285 and https://github.com/openai/codex/pull/13368 gave us inbound request spans in app-server and propagated trace context through Submission. This change finishes the next piece in core: when a request actually starts a turn, we now create a core-owned long-lived span that stays open for the real lifetime of the turn. What changed: - `Session::spawn_task` can now optionally create a long-lived turn span and run the spawned task inside it - `turn/start` uses that path, so normal turn execution stays under a single core-owned span after the async handoff - `review/start` uses the same pattern - added a unit test that verifies the spawned turn task inherits the submission dispatch trace ancestry **Why** The app-server request span is intentionally short-lived. Once work crosses into core, we still want one span that covers the actual execution window until completion or interruption. This keeps that ownership where it belongs: in the layer that owns the runtime lifecycle.
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