dsh-connect: A Data Source Connection and Agent Tool Integration Plugin for DeepSeek Harness

`dsh-connect` is the data source connection plugin for DeepSeek Harness, designed to enable agents to securely access enterprise databases and APIs. It provides core functions—including database connection and schema discovery, AI-based semantic modeling, read-only SQL queries, and fixed HTTP API calls—and supports automatically registering data sources as constrained Agent tools. It enforces strict security boundaries (read-only access and fixed APIs only), local data masking, and credential management, helping agents securely retrieve data on demand during conversations.