Added GNNFingers defense integration and unified example script

examples/defense/README.md

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+\# GNNFingers Unified Pipeline (Example)
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+
+
+End-to-end example to reproduce fingerprint-based ownership verification:
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+\- Node/Graph classification, Link prediction, Graph matching
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+\- AUROC and ARUC
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+\- Optional pairwise verifier (“matcher”)
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+\- Saves plots/CSV/JSON into `--outdir` (defaults to `outputs/`, which is gitignored)
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+
+
+\## How to run
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+
+
+CPU quick test (small run):
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+```bash
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+python examples/gnnfingers/gnnfingers\_full\_pipeline.py --dataset Cora --variants 20 --save-plots
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+
+