wuxiangru915/dsh-review-loop: Add incremental diff review for DeepSeek Harness

The DSH plugin `wuxiangru915/dsh-review-loop` is an incremental diff review tool designed for DeepSeek Harness (DSH) to address the issues of low efficiency and attention dispersion when reviewing full diffs during continuous agent file modifications. This plugin adopts a pure bundle architecture and does not modify the host core code, providing two review entry points with shared logic via a Web UI review panel and the `/review` command. Its core functions include incremental review (recording checkpoints upon approval to display only new changes in subsequent reviews), directly reading git status to reflect actual disk modifications, supporting the injection of approval comments into the agent to achieve a feedback loop, and persisting checkpoints to `$DSH_HOME`.