refactor: clean up tests/ root — delete junk, sort into subdirs
Deleted (7 files):
- test_discovery.py, test_windsurf_integration.py (trivial assert True stubs)
- pytest_simple.ini (unused --collect-only config)
- conftest_path.py (duplicate of conftest.py path setup)
- conftest_fixtures.py, conftest_full.py (unused conftest variants)
Moved to integration/ (6 files):
- test_blockchain_final.py, test_blockchain_nodes.py, test_blockchain_simple.py
- test_basic_integration.py, test_integration_simple.py, test_working_integration.py
Moved to fixtures/:
- mock_blockchain_node.py
tests/ root now has only conftest.py and README.md.
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