Validate the legacy SKCT redirect contract

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "03:30"
+      timezone: Asia/Seoul
+    open-pull-requests-limit: 3

.github/workflows/quality.yml

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+name: Redirect quality
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: redirect-quality-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
+        with:
+          node-version: 22
+      - run: node scripts/check-redirect.mjs https://skct.agenticfabworks.com/ /skct_tool

README.md

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+# SKCT Tool legacy redirect
+
+예전 GitHub Pages 주소의 방문자를 `https://skct.agenticfabworks.com/`으로 보내는 최소 리디렉트 저장소입니다. 기존 기본 경로는 `/skct_tool`이며, 뒤의 경로·쿼리·해시는 새 주소에도 유지합니다.
+
+이 저장소에는 실제 서비스 소스, 인증 정보, 사용자 데이터가 없습니다. 검색 결과 중복을 막기 위해 HTML은 `noindex, nofollow`, `robots.txt`는 전체 수집 금지를 사용합니다.
+
+## 검증
+
+```powershell
+node scripts/check-redirect.mjs https://skct.agenticfabworks.com/ /skct_tool
+```
+
+`.github/workflows/quality.yml`도 push와 pull request에서 같은 검사를 실행합니다. Pages 공개 여부는 별도의 GitHub 저장소 설정입니다. 배포 워크플로가 존재해도 Pages가 자동으로 활성화되지는 않습니다.

scripts/check-redirect.mjs

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+import fs from "node:fs";
+
+const [target, base] = process.argv.slice(2);
+const errors = [];
+
+function check(condition, message) {
+  if (!condition) errors.push(message);
+}
+
+if (!target || !base) {
+  console.error("usage: node scripts/check-redirect.mjs <target-url> <legacy-base-path>");
+  process.exit(2);
+}
+
+let origin;
+try {
+  const parsed = new URL(target);
+  check(parsed.protocol === "https:", "target URL must use HTTPS");
+  check(parsed.pathname === "/" && !parsed.search && !parsed.hash, "target URL must be an origin root ending in /");
+  origin = parsed.origin;
+} catch {
+  errors.push("target URL is invalid");
+}
+
+check(base.startsWith("/") && base.length > 1 && !base.endsWith("/"), "legacy base path must start with one / and have no trailing /");
+
+const required = ["index.html", "404.html", "robots.txt"];
+for (const file of required) {
+  check(fs.existsSync(file) && fs.statSync(file).size > 0, `${file} must exist and be non-empty`);
+}
+
+if (errors.length === 0) {
+  const pages = [["index.html", fs.readFileSync("index.html", "utf8")], ["404.html", fs.readFileSync("404.html", "utf8")]];
+  for (const [name, html] of pages) {
+    check(/<meta\s+name=["']robots["']\s+content=["']noindex,\s*nofollow["']\s*\/?>/i.test(html), `${name}: robots noindex,nofollow is required`);
+    check(/<meta\s+name=["']referrer["']\s+content=["']no-referrer["']\s*\/?>/i.test(html), `${name}: no-referrer policy is required`);
+    check(html.includes(`<link rel="canonical" href="${target}">`), `${name}: canonical URL must be ${target}`);
+    check(html.includes(`const base = "${base}";`), `${name}: legacy base must be ${base}`);
+    check(html.includes("location.pathname.startsWith(base)"), `${name}: redirect must recognize the legacy base path`);
+    check(html.includes("location.pathname.slice(base.length) || \"/\""), `${name}: redirect must preserve the path suffix`);
+    const redirect = "location.replace(`" + origin + "${path}${location.search}${location.hash}`);";
+    check(html.includes(redirect), `${name}: redirect must preserve path, query, and hash`);
+    check(!/[A-Za-z]:\\(?:Users|dev)\\|\/Users\//i.test(html), `${name}: personal or stale absolute path found`);
+  }
+  check(pages[0][1].includes(`<meta http-equiv="refresh" content="0; url=${target}">`), `index.html: fallback refresh must target ${target}`);
+  check(!/http-equiv=["']refresh["']/i.test(pages[1][1]), "404.html: refresh tag must remain absent so the script can preserve the path");
+  check(fs.readFileSync("robots.txt", "utf8").replace(/\r\n/g, "\n").trim() === "User-agent: *\nDisallow: /", "robots.txt must block all crawling");
+}
+
+const result = { base, errors, status: errors.length ? "fail" : "pass", target };
+console.log(JSON.stringify(result));
+process.exit(errors.length ? 1 : 0);