feat: add filter_docs to HybridRetriever and get_retriever_filtered helper

feat: add source_type metadata to all ingested chunks

fix: restore score > 0 threshold in filtered BM25 path + use original index for scoring

feat: add filter_sources param to BM25Index.search()

fix: replace startswith with is_relative_to() for path traversal security

feat: add GET /api/files/{filename} route for citation PDF links

fix: remove unused imports in test_streaming.py

feat: add stream_query_with_web async generator to chain.py

feat: add contextualize_chunks() for LLM-prefixed chunk embeddings

fix: URL size guard for OOM prevention, eliminate double retrieval in chat, fix print

fix: robust JSON extraction in briefing (handles LLM preamble), tighten tests

feat: add briefing module (5-bullet summary + 3 suggested Qs on upload)

fix: use httpx.HTTPStatusError in url_loader test, widen timeout type to float

feat: add URL loader with BeautifulSoup extraction + tests

Add multi-K precision evaluation support

Add Dockerfile and Render config