blog: the one exclusion that repeats, plus the integrity spike and doctrine (#598)

The post listed the messaging carve-out three separate times and never
named the pattern. Messaging is exempt from the two hour cap
(II.B.3.a.i), stays available through night access mode (II.B.2.a.iii),
and keeps delivering notifications during school hours (II.B.4.a). Three
limits negotiated separately, one identical exception. Not evidence the
allegations were true; evidence of what Meta valued most. …