feat(site): rework 19 marketing showcases for composition diversity

Measured convergence before: split hero 13/19, top-bar nav 19/19,
one-line notice footer 14/19, body Pretendard 17/21, 10 similarity
pairs above 0.78. Each showcase got a pre-assigned hero family, nav
form, footer form, type pair, background, accent hue, radius, motion
grammar and material from outputs/rework-2026-10-06/plan.md; direction
cards and the chosen reason are recorded in every design.md.

After: 0 similarity warnings, 19 distinct display faces, 7 hero
families, 5 nav forms, 5 footer forms, no scroll reveals, 5 showcases
with SVG filter materials. Example contact values replace bracket
placeholders under the existing fictional-brand notices. Thumbnails,
OG images, card copy and three e2e assertions updated; dead CSS in
dure-enrollment and hannam-jari removed; similarity.mjs learns the new
font families.

apps/site/public/work/font-foundry/styles/fonts.css

@@ -1,3 +1,4 @@
+/* 마루 부리 — 표본 서체 전용(자체 호스팅, 네이버 공식 배포본 그대로, SOURCES.md). UI 서체는 tokens.css의 Noto Serif KR·Noto Sans KR이다. */
 @font-face {
   font-family: "MaruBuri";
   src: url("../assets/fonts/MaruBuri-Regular.woff2") format("woff2");