dsh-mnemos: Controlled Cross-Session Memory Plugin for DeepSeek Harness

The DSH plugin dsh-mnemos is purpose-built to address agents' "context loss" and disorganized memory management. It is a controlled, extensible cross-session memory plugin that ensures data security through a human approval queue and provides memory retrieval, batch distillation, skill transformation, and SQLite/Git-based storage synchronization. Supporting an open bus mechanism for third-party integration, it also offers a `/memory` command and API interface, aiming to build a long-term memory infrastructure for DSH agents.