dsh-excel-kit: A Dedicated Read-Only Excel Analysis Tool for DeepSeek Harness

dsh-excel-kit is a plugin in the DSH ecosystem for read-only Excel analysis. It adopts streaming parsing to address the memory overflow risks caused by traditional full loading. It focuses on three core capabilities: descriptive analysis, filtering, and pivot analysis. It supports large-file processing and data spill storage, and is date-aware, concurrency-safe, and cancellable. This plugin depends on DSH 0.1.0-rc.6, requires no manual configuration, and can be installed and enabled via command.