The coadd_chisquared package is moribund: it's not in regular use and has not seen any substantive development work in several years. It is included in lsst_apps and lsst_distrib by way of pipe_tasks' table file, but is not used by that package.
The coadd_utils package provides some utility code (setCoaddEdgeBits, copyGoodPixels, CoaddDataIdContainer) which is used by the coaddition routines in pipe_tasks, and a Coadd base class which is only used by coadd_chisquared.
- To drop the pipe_tasks dependency on coadd_chisquared;
- To move the coadd_chisquared repository to https://github.com/lsst-dm/legacy-coadd_chisquared;
- To remove the Coadd class and any supporting code from coadd_utils;
- To remove the (deprecated and unused) makeBitMask function from coadd_utils.