dsh-doc-impact: Deterministic Document Impact Execution Plugin for DeepSeek Harness

The `dsh-doc-impact` plugin establishes a declarative impact graph between code and documentation to address the tendency of documentation being overlooked during agent development. It supports automatic change detection and rule matching, and ensures that the agent reviews or updates affected documentation at the end of an agent turn. The configuration file `.dsh/doc-impact.yml` defines the mappings, and the plugin provides command-line tools and a browser UI for status querying and resolution. The original repository for this plugin has been archived and has now been migrated to the new package `@yadsh/dsh-doc-impact`.