feat(trials): RAG-grounded mechanism summary per clinical trial (#34)

feat(trials): filters, polish & eligibility on main (recover #29 + #30) (#32)

refactor(prompts): consolidate system prompts + docs/lockfile housekeeping (#23)

feat(trials): facility & geography search + targeted mechanism & explainable evidence tier (#22)

feat: retrieval grounding, trial quality, and drug-name typo suggestions

feat(trials): replace hardcoded entity regex with LLM extraction

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

feat: initial project scaffold and Stage 2 ingestion pipeline