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## Why Code-mode responses show host duration without exposing time spent outside the host, including app-server waiting. ## What changed - Add `features.code_mode.experimental_show_cell_overhead`, disabled by default, to show handler duration, host duration, and their difference in `exec` and `wait` response headers. - Reuse the completed handler measurement from tool-call logging, excluding dispatch waiting, and capture it even when logging is disabled. - Preserve the existing timing format when the option is disabled or host timing is unavailable, and preserve boolean feature toggles when merging nested code-mode configuration. ## Testing Add coverage for timing headers, zero and missing host measurements, negative rounding differences, content preservation, and configuration merging. Extend app-server tests across gRPC and stdio to verify timing includes post-host elicitation waiting, and add a response snapshot for successful execution and a failed wait. GitOrigin-RevId: 929b84784d9c6077cf2b5927a90bd2d5f3870078