dsh-attention-health: Degradation Guard and Handoff Tool for Long DSH Sessions

`dsh-attention-health` is a local plugin running on DeepSeek Harness (DSH), designed to address model degradation in long sessions. It requires no internet access or external model calls. By reading local logs, it provides three core features: real-time detection and interruption of repetitive or stalled thinking content, session health assessment, and deterministic generation of handover documents. Installation requires specifying a profile and restarting. It supports Node.js >= 22.19 and helps ensure safe context switching when the model is unreliable.