Paper Full-text Harvest

Pipeline for downloading academic paper full-text at scale. Handles the three classes of sources that exist in 2026:

1. Publisher TDM APIs (Elsevier / Wiley / Springer) — for paywalled content where the institution has a subscription
2. OA aggregators (Unpaywall / OpenAlex / Crossref) — for Open Access copies regardless of publisher
3. Browser fallback (logged-in user profile) — for paywalled publishers without a TDM API (ACS / RSC / T&F / many CN journals)

Decision tree