dsh-openwiki: Integrating OpenWiki's Codebase Knowledge Base Capabilities into DeepSeek Harness

The `dsh-openwiki` plugin for DSH Harness integrates openwiki's codebase knowledge capabilities into DSH, enabling one-click generation, reading, and updating of repository wikis. The plugin supports features such as three-mode views, document reading, Grounded Claims traceability, and automatic updates. It can reuse DSH model configurations and automatically manage the openwiki CLI. Configuration is simple after installation, making it suitable for directly managing codebase knowledge within DSH.