dsh-clear-mind: Model-Autonomous Context Compression and Checkpoint Management

`dsh-clear-mind` is a memory management plugin for DeepSeek Harness (DSH) designed to address context-window saturation in long conversations. By providing the `mind_map` and `clear_mind` tools, it enables the root agent to autonomously compress conversation history, replacing redundant information with auditable checkpoints. The plugin also supports proactive threshold alerts, generates GUI tombstone records, and runs entirely locally without requiring network access. It can effectively reduce inference costs while preserving session traceability.