refactor: design documents save to storage/design, reference requirements from storage/specs

- Change design output directory from storage/specs to storage/design
- Update requirements search path from docs/requirements to storage/specs
- Add default value 'storage/specs' for -r/--requirements CLI option
- Update option description to 'Requirements directory path'

Author: hisaho

bin/musubi-design.js

@@ -41,10 +41,10 @@ program
 program
   .command('init <feature>')
   .description('Initialize design document for a feature')
-  .option('-o, --output <path>', 'Output directory', 'docs/design')
+  .option('-o, --output <path>', 'Output directory', 'storage/design')
   .option('-a, --author <name>', 'Author name')
   .option('--project <name>', 'Project name')
-  .option('-r, --requirements <path>', 'Requirements file path')
+  .option('-r, --requirements <path>', 'Requirements directory path', 'storage/specs')
   .option('--dry-run', 'Show what would be created without writing files')
   .option('--verbose', 'Show detailed output')
   .option('--json', 'Output result as JSON')
@@ -59,7 +59,7 @@ program
         console.log(chalk.dim(`  Output: ${options.output}`));
         console.log(chalk.dim(`  Author: ${options.author || 'Not specified'}`));
         console.log(chalk.dim(`  Project: ${options.project || 'Not specified'}`));
-        console.log(chalk.dim(`  Requirements: ${options.requirements || 'Not specified'}`));
+        console.log(chalk.dim(`  Requirements: ${options.requirements}`));
         console.log(chalk.dim(`  Dry run: ${options.dryRun || false}`));
         console.log();
       }

src/generators/design.js

@@ -36,7 +36,7 @@ class DesignGenerator {
    * @returns {Promise<object>} Result with path
    */
   async init(feature, options = {}) {
-    const outputDir = path.join(this.rootDir, options.output || 'docs/design');
+    const outputDir = path.join(this.rootDir, options.output || 'storage/design');
     await fs.ensureDir(outputDir);
 
     const fileName = `${this.slugify(feature)}.md`;
@@ -605,7 +605,7 @@ Service --> Repository
     const matrix = [];
 
     // Find requirement files
-    const reqFiles = await glob('docs/requirements/**/*.md', {
+    const reqFiles = await glob('storage/specs/**/*.md', {
       cwd: this.rootDir,
       absolute: true,
     });