Show HN: MetaBrain – A local document memory for AI agents (metabrain.eu) AI

MetaBrain is an open-source “local document memory” for AI agents, offering a durable, searchable store for notes, task context, metadata, tags, links, and version history via an `mb` CLI, optional `mbd` daemon, and an embeddable `MetaBrainCore` library. It supports searching by content and filters, applying unified diffs to documents while retaining prior versions, and uses a default local LevelDB-backed store at `.metabrain/store.leveldb`.