dsh-daily-brief: DeepSeek Harness Daily Report Statistics Plugin

dsh-daily-brief is a read-only statistics plugin developed for DeepSeek Harness (DSH), designed to address the need for quickly summarizing workload in multi-live session scenarios. The plugin provides the `daily_brief` tool, supporting statistics on rounds, user messages, assistant replies, and total tool calls within the last N days (default 1 day). It supports limiting the scope of statistics to a single session via an optional `sessionId` parameter, or performing cross-session aggregation by default. The plugin adopts a zero runtime dependency design, iterating only through the session events array in memory without reading from disk or modifying data, ensuring security; it returns empty results instead of throwing errors when encountering missing services or session anomalies. Its core advantage lies in being lightweight, secure, and easy to integrate, making it suitable for users who need to add a daily report statistics entry for the DSH web interface.