DeepSeek Harness Plugin: dsh-subagent-route-badges

`dsh-subagent-route-badges` is a DeepSeek Harness debugging plugin that directly displays routing information in the Header Actions area of sub-agent sessions. It does not intercept requests; instead, it reads `request/header` data through a projection mechanism to display the Provider/Model and thinking level (Effort) in the UI layer. Registered in a purely additive manner, it supports rollback, reads only the necessary data, and effectively resolves the issues of fragmented and inconvenient configuration visibility during debugging.