feat(llama-index): wildcard [r] in get_triplets() + E2E tests

[polaz]

DB gate: G069 ✅ (wildcard edge patterns work in CoordiNode)

Task

• Update get_triplets() and get_rel_map() to use wildcard MATCH (a)-[r]->(b) pattern
• Add E2E integration tests with real embeddings

[coderabbitai]

🔗 Related PRs

#25 - feat: use MERGE for edges, wildcard patterns, type()/labels() functions [merged]

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[polaz]

Реализовано. get_triplets() использует wildcard [r] когда relation_names не передан (base.py:133), get_rel_map() использует MATCH (n)-[r]->(m) (base.py:193). Integration-тест test_upsert_and_get_triplets покрывает этот сценарий. Закрываю как выполненное.