dsh-devkit: A Deterministic Toolkit for Agent Development

`dsh-devkit` is a lightweight deterministic tool plugin designed specifically for DeepSeek Harness (DSH). Based on the MCP protocol, it provides 14 core capabilities, including JSON/YAML conversion, SQL statement transpilation, sensitive data masking, regex testing, JWT decoding, QR code generation, and web page screenshots. By performing operations on the server side, the plugin addresses local execution limitations, ensuring high determinism and low cost (mostly $0.001 per invocation) without storing data. It is ideal for agents to invoke quickly within complex task flows.