feat: multi-region parallel search for top stories

feat: 100% live search-only top stories with multi-query parallelization

fix: guarantee 6 top stories with 30-day fallback and regional expansion

feat: guarantee 6 top stories with vector DB fallback

feat: refine search query and increase top stories limit to 6

fix: resolve Depends NameError and ensure logging integrity

feat: visual top stories, redis caching, and automated 4-hour refresh

fix: remove Transfer-Encoding chunked (illegal in HTTP/2) from SSE response headers

fix: add X-Accel-Buffering header to fix ERR_HTTP2_PROTOCOL_ERROR on HF Spaces SSE stream

chore: add .gitignore, remove __pycache__ and temp files from tracking

feat: hybrid RAG pipeline upgrade

fix(rag-api): add msgpack and confluent-kafka to requirements, safe import

feat(rag-api): hybrid top stories — 3 from Kafka news.processed + 3 from DuckDuckGo

feat: add top stories API + fix reranker tokenizer

fix(news): Add time-based filtering and cache-control to /latest endpoint

feat: Add query enhancements and flexible prompting (v2.1)

fix: make _build_context and execute_chat async for hybrid search

feat(rag): implement hybrid search with live sources and production-grade intent classification