interest-memory: Add cross-session long-term memory to DeepSeek Harness

`interest-memory` is a local long-term memory service maintained by djasdh, designed to address context discontinuity between DeepSeek Harness (DSH) sessions. Built with Go, it utilizes SQLite-vec vector indexing for local storage and retrieval, supporting fully offline operation. The service integrates with DSH via the Cordis plugin `@djasdh/interest-memory-dsh-bridge`, automatically recalling relevant memories at the start of a session and pushing conversation logs at the end. Core features include evidence-based memory storage, a three-stage verification process (check/claim/conflict), automatic merging of semantically similar entries, replacement marking for old entries, and graph-based query visualization. The system provides a REST API to facilitate memory sharing among multi-agent frameworks.