/**
 * @fileoverview G-INV Conformance Tests
 *
 * Tests for Graph Invariants per SPEC Section 11.2.
 *
 * G-INV-1: Node IDs are unique within graph
 * G-INV-2: All dependsOn IDs exist in graph
 * G-INV-3: Graph is a DAG (no cycles)
 * G-INV-4: Non-abstract nodes SHALL NOT depend on abstract nodes (C-ABS-1)
 */
export {};
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