dsh-project-context: DeepSeek Harness Project-Level Persistent Context Plugin

`dsh-project-context` is a plugin that turns DeepSeek sessions into a searchable project context. It manages project memory through four stages (archiving, organizing, consolidation, and handover), supports both manual and automatic triggering, and ensures that session content remains continuous in long-term projects. The plugin is MIT-licensed, uses file locking to ensure data safety, and is ideal for developers who need to maintain complex project contexts.