Add spans to turn lifecycle gaps - #27623
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Why
Codex app-server latency traces do not granularly cover turn task startup and inter-request handoffs. These spans help attribute time across task execution, startup prewarm, in-flight tool completion, and rollout persistence.
What changed
session_task.runspans around task execution andsession_task.flush_rolloutaround flushing pending conversation transcript writes to durable storageregular_task.prepare_run_turnaround regular-turn startup (Send theTurnStartedevent, reset turn-specific reasoning state, and resolve any startup prewarm)startup_prewarm.resolvearound waiting for background session prewarming to finish, fail, time out, or be cancelledVerification
Trigger Codex rollout and observe new spans are included