DeepSeek Harness Dynamic Plugin: dsh-plugin-save-token

DeepSeek Harness (DSH) provides a dynamic plugin, `dsh-plugin-save-token`, designed to reduce token costs in agent conversations through structure-aware compression and deduplication strategies. The plugin supports mechanisms such as lossless TOON encoding, table stride sampling, cross-turn deduplication, and error-row protection, with all optimizations adhering to a reversibility principle. It features a dual-gating mechanism that activates only when the compression ratio exceeds 72% and absolute savings reach 500 B or more, and it integrates a metering dashboard. The plugin is suitable for API JSON or CLI table output scenarios, using disk caching to ensure recoverability, and achieves efficient compression without degrading the model's reasoning quality.