dsh-muscle-diet: Muscle-Building Diet Plan Generation

dsh-muscle-diet is a plugin for DeepSeek Harness (DSH), designed to meet the need for agents to quickly obtain customized strength-training plans. It is implemented purely in Node with no network dependencies, registers the `muscle_diet` tool, and supports returning muscle-building diet plans via parameters. It has specific dependency requirements and is recommended for use only after reviewing the source code.