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I can't find a way to save out my DRC runsets to a file.
There is "Save File" (which file, where?) and there is
"Save All" but there's no facility for putting what I want
and only what I want, where I want, called what I want.
I might be wrong, but there was a bug fix for this already: https://github.com/KLayout/klayout/issues/486. It should have made it into 0.26.4.
You need to right-click on the script in the file list. "Save as" is the last entry.