feat: add local hexagram content for offline reading

Load a versioned Wikisource jing plus project-authored plain drafts so results can show labeled original and vernacular texts without unauthorized modern translations.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/verify-content-contract.mjs

@@ -104,3 +104,52 @@ for (const [name, mutate, expected] of negativeCases) {
 console.log(
   `Content contract verification passed (64 entries cross-checked with Kotlin, ${negativeCases.length} negative fixtures, digest ${digest.slice(0, 12)}…).`,
 );
+
+const packagePath = path.join(repositoryRoot, "content", "packages", "hexagram-content.json");
+const namesPath = path.join(
+  repositoryRoot,
+  "app",
+  "src",
+  "main",
+  "java",
+  "net",
+  "opcapp",
+  "flash",
+  "core",
+  "model",
+  "HexagramNames.kt",
+);
+const namesSource = await readFile(namesPath, "utf8");
+const namesBlock = namesSource.match(/private val names = listOf\(([\s\S]*?)\)/u);
+if (!namesBlock) {
+  throw new Error("HexagramNames.kt name table could not be parsed");
+}
+const catalogNames = [...namesBlock[1].matchAll(/"([^"]+)"/gu)].map((match) => match[1]);
+if (catalogNames.length !== 64) {
+  throw new Error("HexagramNames.kt must contain 64 names");
+}
+
+const published = JSON.parse(await readFile(packagePath, "utf8"));
+const publishedErrors = validateContentPackage(published);
+if (publishedErrors.length > 0) {
+  throw new Error(`Published content package failed validation:\n${publishedErrors.join("\n")}`);
+}
+published.hexagrams.forEach((hexagram) => {
+  const expectedName = catalogNames[hexagram.kingWenNumber - 1];
+  const expectedSymbol = String.fromCodePoint(0x4DC0 + hexagram.kingWenNumber - 1);
+  if (hexagram.name !== expectedName) {
+    throw new Error(`Published package name for ${hexagram.kingWenNumber} must be ${expectedName}`);
+  }
+  if (hexagram.symbol !== expectedSymbol) {
+    throw new Error(`Published package symbol for ${hexagram.kingWenNumber} must be ${expectedSymbol}`);
+  }
+});
+if (published.contentVersion !== "zh-Hans-2026.1") {
+  throw new Error("Published contentVersion must be zh-Hans-2026.1");
+}
+if (!published.specialUsageTexts.qian || !published.specialUsageTexts.kun) {
+  throw new Error("Published package must include Qian 用九 and Kun 用六");
+}
+console.log(
+  `Published content package ${published.contentVersion} passed (digest ${contentDigest(published).slice(0, 12)}…).`,
+);