humanizer: ban 'X is real' assertions and alliterative phrasing

Adds two sections to the humanizer skill:

- 29a: bare assertions of reality ('the risk is real', 'the gains are
  real', 'this isn't hypothetical'). These certify a claim instead of
  evidencing it, and often pair with a negative parallelism. Fix is to
  substitute the evidence or cut the sentence.
- 33a: alliteration and sound-matched phrasing ('promise and peril',
  'seamless synergy', sound-built headings). The matched word is picked
  for its first letter rather than accuracy. Read-aloud test plus a cap
  of one such phrase per page, rather than an outright ban, so
  incidental alliteration is not flagged.

Both get pre-delivery Quick Check entries. Version 2.2.0 -> 2.3.0.