Function accumulate_tch_batch 

pub fn accumulate_tch_batch(
    grid: GridView<'_>,
    peaks: TchPeakBatchView<'_>,
    support: SupportPolicy,
) -> Result<Accumulation, ProfileError>

Accumulate TCH peaks and direct-input derivatives in one support-limited pass.

Local derivative order is intensity, position, Gaussian FWHM, and Lorentzian FWHM.

Errors

Returns ProfileError if support is invalid or allocation fails.