dsh-call-shrink: DeepSeek Harness Call Compression Plugin

`dsh-call-shrink` is DeepSeek Harness's ultimate call compression plugin, designed to merge N LLM calls into a single call. It significantly reduces costs through caching, deduplication, and batch consolidation within a 10-second window. The plugin features stable fingerprinting, protocolized merging, a failure circuit breaker, and a real-time monitoring dashboard. It is easy to install, supports RPC operations, and automatically falls back when parsing fails without affecting the final output.