dsh-tps-meter: Real-time tok/s Floating Window for the DeepSeek Harness Web Interface

The DeepSeek Harness plugin dsh-tps-meter provides a floating window in the Web UI to monitor session output throughput and time to first token (TTFT) in real time. Core features include dual statistical modes (real-time/average throughput), session management, waveform visualization, and a zero-dependency lightweight implementation. It supports double-clicking to close or restore a session and runs without internet access. The calculation logic is based on windowed estimates and per-step time deltas, respectively, and is primarily used for auxiliary monitoring rather than billing.