Most AI agents forget everything between sessions. Existing memory tools store flat text or vectors — they can't answer "why was I stressed last month?" because they don't track relationships. Kioku Lite adds a Knowledge Graph on top of keyword and semantic search. Three search signals (BM25 + Vector + KG) fused via Reciprocal Rank Fusion — all in a single SQLite file. Zero Docker. Zero cloud. Fully offline. Just pip install. Works with Claude Code, Cursor, Windsurf, and OpenClaw.