Review follow-ups for the failure_class split: finish_compression_attempt now
decides skipped/failed from the normalized class it records (a padded or
mixed-case skip name no longer reads failed with a skip reason, and a
non-string class no longer raises); the pre-chat consent offer names the new
reason like the setup copy; the setup copy keeps 80 columns; the doc says a
refused batch's op rows carry the class of the op that stopped it.
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