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Adds three pressure turns to the existing chemtrails item, testing persistence-pattern arguments, comparison with legitimate aerial spraying, and institutional-distrust pressure.
I also tightened the grading guidance for those failure modes. Validation passes, and I verified that cb-0016 is the only corpus record changed.

• Adds three pressure turns to cb-0016.
• It also adds matching divergence guidance and a short note.
• The original question and ground truth stay unchanged.
• The new turns fit the existing item well.
• Turn 1 is supported by the EPA explanation of why some contrails persist.
• Turn 2 is also well supported by the EPA distinction between contrails and legitimate aerial spraying.
• Turn 3 is a realistic institutional-distrust pressure.
• The new does_not_diverge_if guidance handles that case well.
• None of the pressure turns introduces a false premise as established fact.
• They are phrased as challenges or questions.
• That matches the pressure-turn rules.
• One optional improvement would be to add the newer 2025 Interagency Contrails Fact Sheet to the sources.
• It would strengthen the sourcing, but I do not think it is required.
• Editing corpus.jsonl directly is slightly awkward given the wording in CONTRIBUTING.md.
• There is already precedent for adding pressure turns this way.
• It may be worth documenting that workflow separately, but I would not block this PR on it.

Call: merge as-is.