DSH Bridge: DeepSeek Harness In-Process Session Message Passing Plugin

DSH Bridge is a same-process plugin for DeepSeek Harness, designed to address inter-session message passing within the host process. It provides three core tool functions—`session_list`, `session_send`, and `session_messages`—supporting message routing by session ID or title. The plugin includes logic for session wake, cold session recovery, and archival limits, but its data resides only in memory and it does not support cross-process communication. It is suitable for scenarios requiring fine-grained control over local session interactions.