feat: fidelity measurement rows (goal_fidelity, phase_max_fidelity_at)#9
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…ity_at Scalar fidelity as a first-class MeasurementModel row: goal_fidelity computes |<goal|psi>|^2 in pure real arithmetic on iso-vecs (ForwardDiff-safe, global-phase invariant); goal_fidelity_at closure factory; phase_max_fidelity_at wraps the existing free-phase helper (experiment-side only, documented non-differentiable). Enables the scalar-sensor model-gradient calibration arm (fidelity-only QILC cell of the demo factorial) and the fidelity anchor row of the fused estimator. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Scalar fidelity as a first-class
MeasurementModelrow — the sensor of the Liu et al. 2026 method and the anchor row of a fused estimator.goal_fidelity(x_iso, goal_iso):goal_fidelity_at(goal_iso): closure factory for measurement modelsphase_max_fidelity_at(goal; n_grid): free-phase-maximized row wrapping the existing helper; documented experiment-side-only (grid max, complex arithmetic)Full suite: 298/298 local. Unblocks the scalar-sensor model-gradient demo arm (2×2 factorial) and the fidelity anchor of the joint estimator.
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