dsh-subagent-model-visibility: Visualizing Actual Subagent Model Routing in DeepSeek Harness

`dsh-subagent-model-visibility` is a DeepSeek Harness (DSH) plugin designed to visualize the model actually invoked by subagents. By listening to the `llm/stream` route, it directly displays the provider and model actually used in the tool-call lines of native subagents, helping developers observe real routing and failover behavior. The plugin uses Node’s `AsyncLocalStorage` to correlate sessions and supports viewing routing history, while enhancing the debugging experience non-intrusively without modifying core behavior or collecting sensitive data.