Quick update: Hsin-Fang Chiang is already processing DC2 on DM-17555.  Based on the following comments from James Chiang:

For the initial Run1.2i processing, if you were to start off with one tract, I'd recommend using either 4849, 4850, 4639, or 4638. These are the four that are fully enclosed by the 5x5 sq degree protoDC2 simulation region. Of those, 4849 overlaps with the DDF so that one may be of the most general interest to people.

we agreed that indeed 4849 would be the best tract to start with. That processing has already revealed some issues (see DM-17731 & DM-17737) which may need resolving first, but once that track has been satisfactorily processed, I will have a look and summarize any relevant characteristics/QA analysis.

Lauren MacArthur, DM-17731 & DM-17737 should not hold up the QA analysis of those tracts. They indicate bad WCS's in ~1 visit. I'm going to look into what went wrong with the WCS in those visits, but the coadd's should still be fine, since those visits didn't make it through the warping stage..

Michael Wood-Vasey has said that he'd be happy to help with this project; I'll let those already familiar with what's going on chime in on what shape that might take.

Thanks, Jim Bosch. I just got up to speed, and of course Hsin-Fang Chiang has it all figured out already

Tract 4849 is a totally reasonable and good choice. I agree with just picking one tract. I'll follow along on these tickets, but please ping me if you have questions.

Oh, one specific thing. I have the DESC processings of these condensed into pseudo-DPDD Parquet files. Where should I put them on lsst-dev for convenience of comparison?

Great, thanks Michael Wood-Vasey...your input here will certainly be of great value!  As for the DESC processing output, my typical QA-ing with the pipe_analysis repo makes use of butler-ized outputs for direct comparisons of different reruns of the same dataset, so having a standard output repo would be ideal for me at this point if we want to run my comparison scripts of the new Hsin-Fang Chiang processing against any DESC processing (however, my first step will be to get the scripts to run on DESC outputs since there are still some lingering HSC-isms baked in, especially in the colorAnalysis.py script...)

Marking this as invalid as it has been superseded by DM-22954, which defines two tracts of DC2 Run2.2i (y1+y2) to be included in validation runs.

These data were processed on lsst_dev on DM-22816 and I have cerated DM-23250 to run the visitAnalysis.py and coaddAnalysis.py pipe_analysis scripts on the outputs for some basic QA & characterization.