TEst

The v0.2.0 release partially mitigated this with early-stopping when coverage exceeds 80%, but
edge cases remain when the hub is the query target itself (self-loop in the epidemic start node).

Expected: causal scores should discriminate. Actual: they flatten to ~0.95 across the graph.

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## 10. feat: Export graph to Neo4j/Cypher format

**Label**: enhancement

Currently `m1nd` supports Mermaid export (used for the architecture diagram in README). Adding
Cypher export for Neo4j would let teams:
- Visualize the full graph in Neo4j Browser or Bloom
- Run Cypher queries alongside m1nd's activation queries