fix: correct archived directory path in management-manager test

The test was checking for 'archived' directory but the SkillsManagementManager
uses '.archived' (with dot prefix). Fixed the test to check the correct path.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: CrazyBoyM

tests/unit/core/skills/management-manager.test.ts

@@ -223,8 +223,8 @@ This is the updated content of SKILL.md.
     expect.toBeTruthy(archivedSkills.length > 0);
     expect.toEqual(archivedSkills[0].originalName, skillName);
 
-    // 验证archived目录存在
-    const archivedDir = path.join(testSkillsDir, 'archived');
+    // 验证archived目录存在（注意：使用 .archived 而非 archived）
+    const archivedDir = path.join(testSkillsDir, '.archived');
     expect.toBeTruthy(await fs.access(archivedDir).then(() => true).catch(() => false));
   })