dsh-generation: Fork Agent Presets and Run Tasks in the Next Generation

`dsh-generation` is a plugin for DeepSeek Harness that follows a "copy, not compile" philosophy, enabling users to iterate on existing, reliable agent presets. It allows users to fork presets, record their lineage, and run tasks in isolated new sessions. The plugin provides two core tools, `generation_fork` and `generation_run`, supports global tool registration, and requires manual approval. The host must be restarted after installation. It is suitable for scenarios that require modifying and testing based on known presets, but it does not replace Creator mode.