test: Update version expectations from 2.9.0 to 3.0.0

- Update test_package_structure.py (4 assertions)
- Update test_cli_paths.py (1 assertion)
- Aligns tests with v3.0.0 major release
- Fixes 5 failing version check tests

tests/test_cli_paths.py

@@ -138,7 +138,7 @@ class TestUnifiedCLIEntryPoints(unittest.TestCase):
 
             # Should show version
             output = result.stdout + result.stderr
-            self.assertIn("2.9.0", output)
+            self.assertIn("3.0.0", output)
 
         except FileNotFoundError:
             # If skill-seekers is not installed, skip this test