QuestionSummary に about プロパティを追加し @graph 構造に変更

JSON-LD を WebPage + FAQPage の @graph 構造に変更し、
WebPage.about で質問の主題を明示するようにした。

- about は frontmatter の tags から推測（初回の非「一般質問」タグ）
- 64ページすべてに about を追加済み
- AGENTS.md の使用例も更新

1 files changed, 107 insertions, 0 deletions

diff --git a/scripts/add-about-prop.mjs b/scripts/add-about-prop.mjs
new file mode 100644
index 0000000..e519863
--- /dev/null
+++ b/scripts/add-about-prop.mjs
@@ -0,0 +1,107 @@
+import { readFileSync, writeFileSync } from "node:fs";
+import { readdir } from "node:fs/promises";
+import { join, extname, relative } from "node:path";
+
+const DOCS_DIR = join(import.meta.dirname, "..", "src", "content", "docs");
+
+/**
+ * Recursively collect all .mdx files.
+ */
+async function collectMdxFiles(dir) {
+  const entries = await readdir(dir, { withFileTypes: true });
+  const files = [];
+
+  for (const entry of entries) {
+    if (entry.name.startsWith("_")) continue;
+    const fullPath = join(dir, entry.name);
+    if (entry.isDirectory()) {
+      const subFiles = await collectMdxFiles(fullPath);
+      files.push(...subFiles);
+    } else if (extname(entry.name) === ".mdx") {
+      files.push(fullPath);
+    }
+  }
+
+  return files;
+}
+
+/**
+ * Extract tags from frontmatter.
+ */
+function extractTags(content) {
+  const match = content.match(/^---\r?\n([\s\S]*?)\r?\n---/);
+  if (!match) return [];
+  const fm = match[1];
+
+  // Match YAML-style tags array: tags:\n  - tag1\n  - tag2
+  const tagSection = fm.match(/^tags:\s*\n((?:\s+-\s+.+\n?)*)/m);
+  if (!tagSection) return [];
+
+  const tagLines = tagSection[1].match(/^\s+-\s+(.+)$/gm);
+  if (!tagLines) return [];
+
+  return tagLines.map((line) => line.replace(/^\s+-\s+/, "").trim());
+}
+
+/**
+ * Infer `about` from tags.
+ * Uses the first tag that is not "一般質問".
+ */
+function inferAbout(tags) {
+  for (const tag of tags) {
+    if (tag !== "一般質問") return tag;
+  }
+  return null;
+}
+
+async function main() {
+  const files = await collectMdxFiles(DOCS_DIR);
+
+  let updated = 0;
+  let skipped = 0;
+
+  for (const file of files) {
+    const content = readFileSync(file, "utf-8");
+
+    // Only process files that use QuestionSummary
+    if (!content.includes("<QuestionSummary")) continue;
+
+    // Skip files that already have about=
+    if (content.includes("about=")) {
+      skipped++;
+      continue;
+    }
+
+    const tags = extractTags(content);
+    const about = inferAbout(tags);
+
+    if (!about) {
+      console.log(`  SKIP (no topic tag): ${relative(DOCS_DIR, file)}`);
+      skipped++;
+      continue;
+    }
+
+    // Insert about prop after headline prop
+    const newContent = content.replace(
+      /(headline=.*\n)(\s+datePublished=)/,
+      `$1  about="${about}"\n$2`,
+    );
+
+    if (newContent === content) {
+      console.log(`  SKIP (pattern not matched): ${relative(DOCS_DIR, file)}`);
+      skipped++;
+      continue;
+    }
+
+    writeFileSync(file, newContent, "utf-8");
+    console.log(`  about="${about}" → ${relative(DOCS_DIR, file)}`);
+    updated++;
+  }
+
+  console.log(`\nDone: ${updated} updated, ${skipped} skipped.`);
+}
+
+main().catch((err) => {
+  console.error("Error:", err);
+  process.exit(1);
+});