dsh-agent-selector: Unified Task Delegation to External Agents in DSH

The DeepSeek Harness (DSH) plugin `dsh-agent-selector` provides developers with a unified entry point to delegate tasks to external agents (such as Codex, WorkBuddy, and Claude Code) for execution. The plugin uses a two-step “target · model” menu selection to send tasks via multiple channels (CLI, API Key, and the hy3 bridge), and streams the results back to DSH. For security, it features an anti-spoofing mechanism that verifies execution authenticity through tool cards. Installation requires prerequisites such as the DSH version and attention to the reverse dependency risks associated with the hy3 bridge.