[FEATURE] Neo4j Bulk CSV Export (neo4j-admin import)

[KaifAhmad1]

Objective

Enable exporting Semantica graphs into Neo4j-compatible bulk CSV format
for use with neo4j-admin import.

Motivation

Bulk CSV import is the fastest and most reliable way to ingest large graphs
into Neo4j without writing Cypher queries.

Functional Requirements

• Generate node CSV files with:
  • Neo4j-compliant headers
  • Stable node IDs
  • Labels and properties
• Generate relationship CSV files with:
  • START_ID and END_ID
  • Relationship type
  • Properties
• Support multiple node labels

Technical Requirements

• Follow Neo4j bulk import specifications
• Ensure correct quoting and escaping
• Deterministic file naming

Tests

• Unit tests validating CSV structure
• Header correctness tests
• Sample import test (dry-run validation)
• Edge cases:
  • Multiple labels
  • Missing properties

Documentation

• Provide example neo4j-admin import command
• Document mapping assumptions

Files

• semantica/export/neo4j_csv_exporter.py
• tests/export/test_neo4j_csv_exporter.py

Acceptance Criteria

• Generated CSVs pass Neo4j import validation
• Clear documentation for end users