feat: Stage 5 — Gradio UI + HuggingFace Spaces deployment

feat(rag): switch embedding model to BioLORD-2023-C

feat: Stage 4 — entity extraction + knowledge graph + KG-expanded RAG

feat: Stage 3 — RAG pipeline + working end-to-end query

fix(pmc): add rich progress bar to get_pmcids (499 calls, ~3 min)

fix(pmc): use per-PMID elink instead of batch to preserve ID mapping

Merge pull request #1 from KevinIsInCoding/docs/prfaq-dateline

docs: add launch date to PRFAQ press release dateline

docs: correct ALS genetics claim in PRFAQ, strengthen rationale

docs: add PRFAQ for candle-fire

feat: initial project scaffold and Stage 2 ingestion pipeline