multi query enhancement

added additional cross encoder models

docpilot chat data decoupled between experimental and production mode, selector behavior fixed

AWS deployment using EC2 and dropdown selector initial mapping

experimentation and production mode frontend

initial benchmark and improve query rewriting

feat(retrieval): implement end-to-end retrieval score lineage and observability across dense, BM25, RRF, and reranking stages

add cross-encoder reranking and update README

Hybrid merge logic replaced with RRF fusion in runtime.py

hybridize

Initial PilotMaster deployment