refactor: Remove circular test dependencies and meta-testing anti-patterns

Clean up test infrastructure by removing problematic tests that create
circular dependencies and execute the test suite from within tests.

Key removals:
- Delete test_issue_57_test_efficiency_improvements.py entirely (12 tests)
  - Contained tests that ran `make test-tdd`, `make test-status` etc.
  - Created circular dependencies where tests execute the entire test suite
  - Violated separation of concerns between testing and test infrastructure

- Remove self-execution blocks from 11 test files
  - Eliminated `if __name__ == '__main__': pytest.main([__file__, '-v'])` patterns
  - Prevents confusion and potential circular execution paths
  - Test files should be run via pytest, not as standalone scripts

Test Infrastructure Improvements:
- Reduced test count from 701 to 689 tests (removed 12 problematic tests)
- Eliminated subprocess calls to `make test-*` commands from within tests
- Removed `pytest.main()` calls that could cause circular execution
- Maintained clean separation between test infrastructure and actual tests

Impact:
- No more tests testing tests (circular dependency elimination)
- Cleaner test execution without subprocess complexity
- Proper test isolation and independence
- Faster and more reliable test runs

The proper way to test infrastructure is to test the underlying functions
directly, not to execute the entire test suite from within a test.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tests/test_schema_visualization.py

@@ -425,5 +425,3 @@ class TestOutputConsistency:
             test_file.unlink()
 
 
-if __name__ == '__main__':
-    pytest.main([__file__, '-v'])