dsh-agent-delegate: Delegation Governance and Workflow Management for DeepSeek Harness

`dsh-agent-delegate` is a delegated-agent plugin designed to resolve issues in DSH sub-agent invocation—such as uncontrolled depth, role overreach, and concurrency overflow—through code-level controls. It provides depth and concurrency control, role filtering, write isolation via independent Git worktrees, and a patch-based result-merge mechanism. The plugin supports configuration-driven limits on delegation depth, sub-agent count, and permission propagation, ensuring that sub-agent changes are merged only after acceptance by the parent task. It is well suited to scenarios requiring strict control over sub-agent behavior.