fix: update Dockerfile for HF Spaces (port 7860, non-root user)

fix: restore HF Spaces front-matter in README

fix: secure cookie for HTTPS/HF Spaces deployment

track PDFs with LFS

Merge latest UI and retrieval updates

Polish retrieval workflow and UI

feat(document-matching): simplify to LLM-based document filtering

feat(document-matching): implement two-stage document matching with LLM reranking

Integrate Jina embeddings and refresh assignment README

Add Fly.io deployment configuration

Add Render blueprint deployment config

Initial commit: DocsQA app