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* trace(perf): add provider prewarm span and prefix-stability counters * feat(openai): optimized turn session with prewarm and prefix telemetry * feat(providers): gate optimized OpenAI turn sessions behind env flag * feat(cli): wire optimized turn sessions into headless exec * docs(readme): document the optimized OpenAI turn-session toggle * fix(openai): include tool descriptions in prefix digest, harden gate and test bounds * fix(openai): isolate prewarm tracing, skip non-reusable transports, fingerprint wire order and cache key * test(openai): pin keep-alive transports in probe-expecting tests * feat(providers): preserve resolved capabilities on switched-model fallback sessions