I thank the respondents, but you were looking in the wrong direction. Sigil changed perfectly good HTML code on every chapter of every document it worked with today. The problem had to be a corrupt Sigil file or Sigil itself. I was hoping to learn which file was the likely culprit. I should have made that clear. (Message to Self: Don't post while you're p1sst.)
I solved the problem without discovering its exact cause. I trashed Sigil and every associated file, including invisible files and cache files. (I use the free utility EasyFind from DEVONtechnologies to find the files.) I reinstalled Sigil that was happy with the correct <head> and meta items. I used Find and Replace All to fix the weird errors.
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