/**
 * Contract Tests for InstrumentedExpander
 *
 * These tests verify that InstrumentedExpander correctly implements
 * the GraphExpander interface contract while also providing instrumentation
 * features for tracking:
 * - Node expansions
 * - Expansion order
 * - Hub node identification
 * - Reset functionality
 *
 * InstrumentedExpander is used for testing algorithms that need to
 * verify expansion behavior (e.g., hub-deferring properties).
 */
export {};
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