dsh-cardian: A Local Obsidian Knowledge Hub Plugin

The core philosophy of the DeepSeek Harness (DSH) plugin `dsh-cardian` is to ground an agent’s knowledge-hub capabilities in a local Obsidian vault. It comprises three modules—RepoWiki, knowledge cards, and cross-session memory—supporting atomic knowledge management, SM-2 flashcard review, and activity-based automatic refresh. The plugin exposes 36 tools and supports CLI and standalone operation modes, aiming to enable the persistence and automatic updating of code repositories, knowledge cards, and session memory through structured documentation and a tool matrix.