dsh-workspace-history: Recording Compressed Workspace Summaries for DeepSeek Harness

The dsh-workspace-history plugin resolves the lack of log traceability by persisting DeepSeek Harness compressed summaries to the file system. It records each compression event as an independent Markdown file, relies on dsh-granular-settings for feature toggles, and uses dsh-workspace-overview to provide a visual browsing interface. Users can install and configure it via the command line and view historical summaries in the History tab of Workspace Overview, making it easier to troubleshoot issues and track workspace state.