DeepSeek Harness Cross-Session Persistent Memory Plugin

`dsh-tool-memory` is a memory plugin for DeepSeek Harness, designed to address the loss of cross-session memory in agents. By injecting long-term memory into the system prompt as plain-text snapshots, it provides bounded, secure, and cross-session memory capabilities. The plugin supports frozen snapshot injection, six memory-manipulation tools, automatic background information consolidation, and security mechanisms such as injection-attack protection. After installation, users can manage memory through natural-language commands or configuration files, making it suitable for DSH applications that require long-term context maintenance.