//! `GraphBuilder` relation extraction tests.
//!
//! The unified graph migration (v2.0.0) is complete. StagingGraph-based
//! relation extraction is tested in each language plugin's own test suite
//! (e.g., `sqry-lang-typescript/tests/edge_tests.rs`).
//!
//! This file previously contained placeholder stubs for cross-language
//! relation tests that were never implemented. Per-plugin integration
//! tests now provide comprehensive coverage for each language's
//! graph builder.