dsh-plugin-meta-memory: Structured Long-term Memory for DeepSeek Harness

The dsh-plugin-meta-memory is a plugin in the DSH ecosystem designed to address issues of dispersed long-term memory and context reuse. It organizes memory into a "unit + record" structure, where each record distinguishes between `brief` (summary) and `full` (complete content), supports automatically injecting relevant `brief` into the Agent context, and maintains a global `index` to organize clues. The plugin provides a CLI tool `mm` that supports operations such as initialization, list viewing, reading, searching, and index management, allowing users to name units in a `verb-modifier-noun` format, enabling hierarchical storage and on-demand loading of memory. Its main features include memory classification, quick summary scanning, full record retrieval, and automatic context injection. Configuration options include `m