JevDo: A Next-Generation Harness Architecture with Jev as the Scheduling Core

JevDo is a next-generation plugin architecture built on DeepSeek Harness, designed to address the problem of repeatedly reasoning about startup workflows during development. Its core separates scheduling logic from execution logic: **Jev** decides, based on history, whether to invoke a persisted **Action** (operation) or request the main model; **Action** saves reusable commands across sessions. Through the `jevaction_create` and `jevaction_validate` tools, the plugin turns the large model from the sole executor into one option among others, reducing the cost of invoking the main model. It is suitable for everyday bug fixing, CI error resolution, and release preparation, with later turns able to independently complete some tasks. The project is built with Node.js 24.14+ and requires DeepSeek.