Agent 1: SpectralMeasure.lean — CRITICAL PATHcauchySeq_stepApprox PROVED — step function approximants form Cauchy sequence via monotone bounded convergence. This completes the pvmIntegralOp definition chain.integralBounded_adjoint PROVED — PVM integral adjoint identity via limit + projection self-adjointnesssum_norm_sq_proj_mono — monotonicity of projection norm-squared partial sums (sorry-free)norm_sq_stepApprox_diff_le — Cauchy bound via Pythagorean theorem (sorry-free)
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