Three example files were loose in examples/ root instead of organized into topic-specific subdirectories.

Changes

Moved files to appropriate subdirectories:

• visualization_pymnet_style.py → examples/visualization/
• master_regulators_example.py → examples/case_studies/
• r_interop_example.py → examples/advanced/

Fixed r_interop_example.py sys.path after move:

# Before (worked from examples/ root)
sys.path.insert(0, str(Path(__file__).parent.parent))

# After (works from examples/advanced/)
PROJECT_ROOT = Path(__file__).resolve().parents[2]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

Only README.md remains in examples root. CI test discovery (rglob("*.py")) continues working unchanged.

• Fixes examples folder #961

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