test(eval): add interview behavior eval harness

build/eval/interview/fixtures/s6-design-md/index.html

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+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8" />
+  <title>동네 꽃집 — 온라인 주문</title>
+  <style>
+    :root {
+      --color-bg: #fdf6f0;
+      --color-surface: #ffffff;
+      --color-text: #2e2620;
+      --color-accent: #d97757;
+      --color-accent-hover: #d97757;
+      --font-family: "Pretendard", system-ui, sans-serif;
+      --radius-base: 12px;
+    }
+    body {
+      margin: 0;
+      background: var(--color-bg);
+      color: var(--color-text);
+      font-family: var(--font-family);
+    }
+    .hero {
+      padding: 96px 24px;
+      text-align: center;
+    }
+    .hero h1 { font-size: 2.75rem; margin: 0 0 16px; }
+    .cta {
+      display: inline-block;
+      margin-top: 24px;
+      padding: 14px 28px;
+      background: var(--color-accent);
+      color: #fff;
+      border-radius: var(--radius-base);
+      text-decoration: none;
+      font-weight: 600;
+    }
+    .cta:hover {
+      background: var(--color-accent-hover);
+    }
+  </style>
+</head>
+<body>
+  <section class="hero">
+    <h1>오늘의 꽃, 오늘 배달</h1>
+    <a class="cta" href="#order">지금 주문하기</a>
+  </section>
+</body>
+</html>