Add an opt-in integration test that provisions a real Neo4j and asserts the
pushed graph, exercised only when a container runtime is available.
Scope:
- test/test_neo4j_bolt.py, gated by RUN_CONTAINER_TESTS=1
- assert full push, idempotent re-push, vanished-declaration cleanup, full-run orphan prune
Add an opt-in integration test that provisions a real Neo4j and asserts the
pushed graph, exercised only when a container runtime is available.
Scope: