True when a new [^N]: definition line was appended.
[^N]:
Final post-NORMALIZE article, or null when the patch was a NO-OP.
The [^N] number assigned to the chunk (null when never reached).
[^N]
Skip reason; null on success.
True when the chunk's conversation was already cited (reused marker, no new def).
True when a new
[^N]:definition line was appended.