test(lists): add boundary and fragment tests for extractListId

- Test that 5-digit IDs (minimum length) are accepted
- Test that URLs with fragment identifiers work correctly

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

tests/cli.test.ts

@@ -95,8 +95,17 @@ describe('CLI utilities', () => {
       expect(extractListId('1234')).toBeNull();
     });
 
+    it('should accept minimum 5-digit IDs', () => {
+      expect(extractListId('12345')).toBe('12345');
+    });
+
     it('should trim whitespace from input', () => {
       expect(extractListId('  1234567890123456789  ')).toBe('1234567890123456789');
     });
+
+    it('should extract ID from URL with fragment', () => {
+      const url = 'https://x.com/i/lists/1234567890123456789#section';
+      expect(extractListId(url)).toBe('1234567890123456789');
+    });
   });
 });