Two bar traces with signed values under barmode: 'relative' —
the standard plotly idiom for a population pyramid or a Likert scale.
MAIDR reads the opposed signs as what they are: a direction rather than a
magnitude. The pitch takes the size of each bar and the announcement names
the side, so the larger cohort is the higher note whichever way it points,
and the summary row down each category is the balance between the two
sides rather than a total.