dsh-session-cleaner: Removing Sessions for the Running DeepSeek Harness Web Runtime

`dsh-session-cleaner` is a DeepSeek Harness plugin (version 1.0.2) maintained by `fountunt` under the MIT license, designed to address session cleanup issues during `dsh web` runtime. This plugin allows deleting running sessions via the Web UI or API without restarting the service, and synchronously removes three types of data: live store entries, workspace records, and disk artifacts. Its core features include providing a "Delete session" entry in the sidebar menu and registering the `POST /api-ext/session.delete` API route, which supports passing `sessionId` in the JSON request body. Installation