dsh-plugin-xt-memory: DeepSeek Harness Cross-Session Self-Learning Memory Plugin

`dsh-plugin-xt-memory` is a plugin for DeepSeek Harness designed to address cross-session memory needs in long conversations. It provides memory management across two dimensions: injection and tools. The injection component uses the BM25 algorithm to retrieve memory snippets based on relevance scores, while the tool component provides read and write interfaces. In the background, it asynchronously extracts key information from conversations and deduplicates and merges it. Data is persistently stored in local Markdown files and supports an automatic archival mechanism. Developers can adjust parameters such as budget and extraction frequency through configuration options to enable long-term memory capabilities for agentic applications.