DeepSeek Harness Plugin: dsh-dsml-artifact-guard

`dsh-dsml-artifact-guard` is a lightweight stream interceptor designed specifically for DeepSeek Harness. It cleans up DSML protocol tags leaked by upstream models to prevent UI pollution and rendering failures. The plugin strictly adheres to the synchronous streaming contract, uses a chunked buffering pipeline to handle tags that span data packets, and adopts a 100% fail-open security policy to ensure that legitimate text is not discarded. It natively integrates a settings card, supports `sanitize`, `audit`, and `disabled` modes, and provides automatic updates and theme compatibility. It is suitable for scenarios that require a clean interface in DeepSeek Harness and want to avoid downstream parsing errors.