v4.22.0 — structure discipline from published writing standards

Added — structure discipline from published writing standards

The reader rubrics shipped in 4.21.0 were professional judgment; this
release grounds the quality guidance in published, citable standards and
adds the piece none of the gates could give: how paragraphs and sections
should be built. Every authoring brief now carries a "Structure
Discipline" section:

• The paragraph rule (Kording & Mensh, Ten simple rules for
  structuring papers, PLOS Comput Biol 2017): every paragraph runs
  Context → Content → Conclusion — first sentence says what it is about,
  last sentence says what to remember. A run of parallel evidence
  sentences with no concluding sentence reads as a list, not an argument.
• Per-profile recipes: lab discussions follow the university-rubric
  pattern (result → quantitative comparison → mechanism → verdict against
  the acceptance threshold; ASEE/WSU/NC State LabWrite); papers build each
  results paragraph around its figure (Whitesides, Adv. Mater. 2004) with
  one central contribution; proposals and business reports lead with the
  answer and open as SCQA (Minto, The Pyramid Principle); admissions
  documents develop 2-4 defining experiences in depth instead of listing
  everything (MIT EECS CommLab, Cornell Graduate School).

The web research also validated the 4.21.0 rubrics themselves — quantified
comparison, mechanism over restatement, answer-first, incidents over
adjectives all match the published guidance; sources are now cited in the
code. Guidance only: no new gates. 451 tests and both benchmark --checks
pass.