High-level pipeline

One-shot helpers for scripts that skip the GUI / session model.

combine_layers	Stretch, colorize, and combine a list of 2D arrays into one RGB image.
combine_from_files	Load FITS files, optionally align them to a common grid, then combine.
save_combined	Save a combined RGB image to FITS, optionally annotating the header with multicolorfits provenance (version, timestamp, layer colors/scales).
align_stack	High-level alignment: pick a master header, reproject every layer onto it, return [(data, hdr), ...] ready for the color pipeline.
reproject_stack_to_header	Reproject every (data, header) pair onto a single target header.
reproject_stack_to_reference	Reproject all images onto the grid of a reference layer.
downsample_for_preview	Downsample a 2D or RGB image so its longest side is at most max_size.