doco-dsh: Native Integration of the Doco Knowledge Base into DeepSeek Harness

doco-dsh is the native plugin for DeepSeek Harness, designed to connect a Doco knowledge base and address the complexity of external Agent integration. The plugin provides nine tools that support block-level addressing, full-text search, structured reading, and draft saving. Write operations are disabled by default and require approval and scope validation. The plugin depends on the host environment, with API and permissions configured through environment variables, and can be installed with one click via the plugin manager. Typical usage includes authorizing access with `/doco connect`, retrieving spreadsheet structure, and performing atomic batch data updates.