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Constructs GHZ states using BFS spanning tree on the device connectivity graph, then estimates fidelity via direct fidelity estimation (DFE) or parity oscillation curve fitting. - BFS-based CNOT chain works with any device topology (all-to-all, heavy-hex, grid) - DFE method: 2 circuits (Z-basis + X-basis), fast - Parity oscillation method: 1 + N phase-swept circuits, rigorous - Optional flag qubit error detection via ZZ stabilizer checks - Post-selection on flag qubit outcomes - Fidelity = (population + coherence) / 2 - 21 unit tests covering circuit construction, post-selection, and fidelity estimation
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Closes #232