Update build scripts and enhance development workflow: Revise package.json to streamline build commands, replacing deprecated scripts with new chapter-specific build commands. Update CONTRIBUTING.md to clarify local development instructions and improve chapter sync processes. Enhance README.md with updated serving and build commands for better user guidance. Add new types for Bun in devDependencies and update the feed and sitemap to reflect recent content changes.

scripts/validate-curriculum.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "bun:test";
+import { validateCurriculum } from "./validate-curriculum";
+
+describe("validate-curriculum", () => {
+  it("has no curriculum validation errors", async () => {
+    const result = await validateCurriculum();
+    if (result.errors.length > 0) {
+      const details = result.errors
+        .map((error) => `[${error.file}] ${error.message}`)
+        .join("\n");
+      throw new Error(`Curriculum validation failed:\n${details}`);
+    }
+    expect(result.errors).toHaveLength(0);
+  });
+});