Generate course-level skuilder.json for imported courses

The previous fix only generated course-level skuilder.json files for newly
scaffolded empty courses. Imported courses (via --import-course-data) were
missing this file, causing the manifest hierarchy to be incomplete.

Now packCourses() creates the course-level skuilder.json after each course
is successfully packed, ensuring all courses have the complete 3-level structure.

Author: claude

packages/cli/src/utils/pack-courses.ts

@@ -1,5 +1,6 @@
 import chalk from 'chalk';
 import path from 'path';
+import { promises as fs } from 'fs';
 
 export interface PackCoursesOptions {
   server: string;
@@ -39,6 +40,38 @@ export async function packCourses(options: PackCoursesOptions): Promise<void> {
       });
 
       console.log(chalk.green(`✅ Successfully packed course: ${courseId}`));
+
+      // Create course-level skuilder.json for the packed course
+      const coursePath = path.join(outputDir, courseId);
+      const manifestPath = path.join(coursePath, 'manifest.json');
+
+      // Read the manifest to get course title
+      let courseTitle = courseId;
+      try {
+        const manifestContent = await fs.readFile(manifestPath, 'utf-8');
+        const manifest = JSON.parse(manifestContent);
+        courseTitle = manifest.courseName || manifest.courseConfig?.name || courseId;
+      } catch (error) {
+        console.warn(chalk.yellow(`⚠️  Could not read manifest for course title, using courseId`));
+      }
+
+      // Create course-level skuilder.json
+      const courseSkuilderJson = {
+        name: `@skuilder/course-${courseId}`,
+        version: '1.0.0',
+        description: courseTitle,
+        content: {
+          type: 'static',
+          manifest: './manifest.json',
+        },
+      };
+
+      await fs.writeFile(
+        path.join(coursePath, 'skuilder.json'),
+        JSON.stringify(courseSkuilderJson, null, 2)
+      );
+
+      console.log(chalk.gray(`📄 Created skuilder.json for course: ${courseId}`));
     } catch (error: unknown) {
       console.error(chalk.red(`❌ Failed to pack course ${courseId}:`));
       console.error(chalk.red(error instanceof Error ? error.message : String(error)));