georgeguimaraes/arcana: Embeddable RAG library for Elixir/Phoenix

Arcana is an embeddable RAG library for Elixir/Phoenix that adds vector search, document retrieval, and AI-powered question answering to any Phoenix application. It uses your existing Ecto Repo and PostgreSQL with pgvector for vector storage, eliminating the need for a separate vector database, and supports both simple RAG and agentic RAG pipelines with query expansion and self-correction.

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