kianajunjie/hippocampus_22: Add a forgettable emotional memory layer for companion robots

`hippocampus_22` is a memory plugin in the DSH community, maintained by kianajunjie. With 2 GitHub stars, a current version of 0.2.0, an MIT license, a requirement of Node.js 22.5 or higher, zero dependencies, and reliance solely on Node's built-in SQLite, it processes each conversational turn into structured memory with emotional weighting. It operates through five stages: event encoding, consolidation, forgetting, associative recall, and meta-memory, labeling each memory with a certainty level such as "clearly remembered," "vaguely remembered," or "remembering that it happened." Users can access it via three interfaces: CLI, a JavaScript library, and HTTP. Memory is stored in a local SQLite file, isolated per user, supports relationship layers, and invalidates upon contradiction. The article introduces its capabilities, memory flow, the DSH plugin installation command, CLI usage, and applicable boundaries.