dsh-solo-agent: DSH Solo Orchestration and Context Optimization Plugin

`dsh-solo-agent` is a DSH plugin designed to address context bloat and scheduling chaos when a single Agent handles complex tasks. It injects the `solo` preset into the user Agent and achieves closed-loop scheduling through strict permission control. The plugin positions the Solo main Agent as a pure orchestrator, without file system tools and retaining only necessary instruction tools, while delegating complex editing, testing, and verification tasks to four specific sub-agents (`subagent_explore`, `subagent_editor`, `subagent_general`, and `subagent_verify`). This structure, combined with the minimal subagent anchoring mechanism and compression enabled by default, ensures task complexity