DeepSeek Harness Plugin: dsh-session-health (Session Health Reminder)

DeepSeek Harness (DSH) introduces the `dsh-session-health` plugin, designed to monitor long-running agent sessions. The plugin displays session health in real time via a floating button in the bottom-right corner, including core metrics such as context usage, compression analysis, and token consumption. The score is calculated using a weighted combination of three factors: context usage, compression count, and cache hit rate, and is categorized into four levels: healthy, fair, sub-healthy, and unhealthy. When health drops below 60%, the panel offers a “generate handoff and restart session” feature to help developers optimize session performance and cost.