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