Emit turn cost telemetry for ChatGPT sessions - #41944
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## What changed - Query workspace-visible turn estimates for ChatGPT-authenticated sessions through the appropriate Codex or ChatGPT endpoint. - Track completed response IDs and emit `codex.turn.cost_microusd` only when the estimate is nonnegative, visible, and covers every observed response. - Keep error response bodies out of turn-cost worker logs. ## Testing - Cover both endpoint styles, nullable estimates, settlement validation, exact micro-USD conversion, and response-ID tracking. - Add an app-server integration test that verifies a settled ChatGPT turn reaches the OTLP metrics exporter with its turn, conversation, and auth-mode attributes. GitOrigin-RevId: 6ae3f8df729fad52984a0c6efafd8c96c7214e55
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Emit turn cost telemetry for ChatGPT sessions
What changed
codex.turn.cost_microusdonly when the estimate is nonnegative, visible, and covers every observed response.Testing