OpenTelemetry and Langfuse observability exporter for DeepSeek Harness: turn/step/tool/LLM spans, token and cost metrics, and sanitized LLM prompt/completion capture from the session/event stream, with async batching, bounded offline buffering, and retry

DeepSeek Harness 桌宠插件：元气鲸鱼娘陪你写代码 🐋（桌面端 0.2.0-rc.2 与旧版 Web 双端支持）