DeepSeek Harness Plugin: dsh-history-fold

The DeepSeek Harness plugin dsh-history-fold addresses the increased token consumption and reduced speed caused by growing conversation turns. It works by folding the oldest history into a single message and writing it to a local lossless archive file. The plugin operates in a lazy execution mode, does not log by default, and DSH upgrades do not break it. Its core advantages are lossless archiving, recoverability, and hierarchical path indexing, enabling complete restoration of historical content while maintaining decoding speed.