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lib/font-fingerprint.mjs replaces the three-number fingerprint with size-invariant shape features (x-height ratio, stroke contrast, stem width, run-length quantiles, roundness, serif signal, width spread) and a noise-normalized distance; family recall on a held-out self-test rose from 13% to 72% top-5. data/font-index.json carries the whole Google Fonts catalog (3,092 faces at two cap sizes, 707 KB); font-match --rank fingerprints the comp crop, takes the 25 nearest faces from the index (plus the model's own names), renders them at the comp's cap height, ranks by the same distance, and prints a proof sheet and the CSS to use. scripts/build-font- index.mjs rebuilds the index at release time. AI-assisted (Claude). Co-Authored-By: Claude <noreply@anthropic.com>