The default 2D Bragg integrator is ProfileIntegrate2D (Kabsch profile fit with a
per-resolution-shell Gaussian profile and de-biased variance), with box summation
as the seed/fallback (--integrator boxsum|gaussian|empirical). Section 9 and the
section 13 note both still claimed integration was summation-only with no profile
fitting; rewrite them to describe the profile-fit default.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>