Add Knowledge Fabric to Platforms

[sagarv48]

Item Description

• Knowledge Fabric - Hybrid RAG evidence retrieval platform combining pgvector (HNSW) and PostgreSQL full-text search (tsvector) with Reciprocal Rank Fusion (RRF) and Row-Level Security (RLS).

Project Details

• Repository: https://github.com/sagarv48/knowledge-fabric
• License: Apache 2.0 (Open Source)
• Primary Use Case: Eliminates specialized vector database sprawl by allowing engineering teams to run dense vector search (pgvector HNSW) and lexical search (tsvector) in a single ACID PostgreSQL database with Reciprocal Rank Fusion (RRF). Also features native PostgreSQL Row-Level Security (RLS) for multi-tenant isolation.
• Section: ### Platforms (alphabetically between Atlas4D and neond)