English how-to: why per-call routing exists, what Jev chooses, and what the proxy keeps continuous.
Read the guideGuide collection
Start with the page that matches the intent. Architecture is approved; runtime remains a validation prototype until real Codex A→B→A switching and controlled comparisons pass.
English how-to: independent acceptance, Router Compass evidence, and why savings are measured not assumed.
Read the guide中文场景页：讲清逐调用架构、前置条件、档位与当前原型边界。
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