style use set comprehensions

[LVivona]

Summary

If a set transformation is going to be made to mutate the data, it's better to just put it in a comprehension. This change enforces the use of set comprehensions in places where set semantics are already required.

• Replaces list construction + set(...) with direct set comprehensions for clearer intent and simpler encapsulation.
• Reduces redundant conversions and improves readability without changing behaviour or assumptions.

[LVivona]

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[thempel]

At the moment we’re focusing our review capacity on new features and bug fixes, so we won’t be able to take this PR forward. We really appreciate the effort, though.