The above answer (“So it turns out”) turns out not to be the answer after all. With the fix described there, comments that I submitted were rendered correctly but comments that others submitted were not (even though I was submitting through the same comment interface that everyone else was). Go figure.
Anyway, the real fix turns out to be to restore wp-comments-post.php to its original form (eliminating the str_replace that I had added per the earlier answer) and to turn to a file called comments.php (which is part of the K2 theme), where the problem was solved by replacing the line
<?php comment_text(); ?>
with
<?php nl2br(comment_text()); ?>
This definitely works. Why it was suddenly necessary remains a great mystery.
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